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Fathers favour sons, mothers don't discriminate: Sex-biased parental care in northwestern Tanzania

  • Anushé Hassan (a1), Susan B. Schaffnit (a2), Rebecca Sear (a1), Mark Urassa (a3) and David W. Lawson (a2)...

Abstract

Variation in parental care by child's sex is evident across cultures. Evolutionary theory provides a functional explanation for this phenomenon, predicting that parents will favour specific children if this results in greater fitness payoffs. Here, we explore evidence for sex-biased parental care in a high-fertility, patriarchal and polygynous population in Tanzania, predicting that both mothers and fathers will favour sons in this cultural setting. Our data come from a cross-sectional study in rural northwestern Tanzania, which included surveys with mothers/guardians of 808 children under age 5. We focus on early childhood, a period with high mortality risk which is fundamental in establishing later-life physical and cognitive development. Examining multiple measures of direct/physical care provision (washing, feeding, playing with, supervising, co-sleeping and caring when sick), we demonstrate that fathers favour sons for washing, feeding and supervising, while maternal care is both more intensive and unrelated to child sex. We find no difference in parental care between girls and boys regarding the allocation of material resources and the duration of breastfeeding; or in terms of parental marital and co-residence status. This bias towards sons may result from higher returns to investment for fathers than mothers, and local gender norms about physical care provision.

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This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

*Corresponding author. E-mail: anushe.hassan@lshtm.ac.uk

References

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Almond, D and Currie, J (2011) Killing me softly: the fetal origins hypothesis. Journal of Economic Perspectives 25(3), 153172. https://doi.org/10.1257/jep.25.3.153
Arnold, F, Choe, MK and Roy, TK (1998) Son preference, the family-building process and child mortality in India. Population Studies 52(3), 301315. https://doi.org/10.1080/0032472031000150486
Baker, M and Milligan, K (2016) Boy–girl differences in parental time investments: evidence from three countries. Journal of Human Capital 10(4), 399441. https://doi.org/10.1086/688899
Becker, GS and Tomes, N (1976) Child endowments and the quantity and quality of children. Journal of Political Economy 84(4, Part 2), S143S162. https://doi.org/10.1086/260536
Bereczkei, T and Dunbar, R (1997) Female-biased reproductive strategies in a Hungarian Gypsy population. Proceedings of the Royal Society, London B 264, 1722. Retrieved from http://rspb.royalsocietypublishing.org/content/264/1378/17.short
Bereczkei, T and Dunbar, RIM (2002) Helping-at-the-nest and sex-biased parental investment in a Hungarian Gypsy population. Current Anthropology 43(5). Retrieved from http://www.journals.uchicago.edu/doi/full/10.1086/344374
Brown, GR, Laland, KN and Borgerhoff Mulder, M (2009) Bateman's principles and human sex roles. Trends in Ecology and Evolution 24(6), 297304. https://doi.org/10.1016/j.tree.2009.02.005
Brunson, J (2010) Son preference in the context of fertility decline: limits to new constructions of gender and kinship in Nepal. Studies in Family Planning 41(2), 8998. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/21466108
Campbell, EK (1991) Sex Preferences for offspring among men in the western area of Sierra Leone. Journal of Biosocial Science 23(3), 337342. https://doi.org/10.1017/S0021932000019398
Chen, LC, Huq, E and D'Souza, S (1981) Sex bias in the family allocation of food and health care in rural Bangladesh. Population and Development Review 7(1), 55. https://doi.org/10.2307/1972764
Childs, G, Goldstein, MC and Wangdui, P (2011) Externally-resident daughters, social capital, and support for the elderly in rural Tibet. Journal of Cross-cultural Gerontology 26(1), 122. https://doi.org/10.1007/s10823-010-9135-5
Clarke, P (2008) When can group level clustering be ignored? Multilevel models versus single-level models with sparse data. Journal of Epidemiology & Community Health 62(8), 752758. https://doi.org/10.1136/jech.2007.060798
Clutton-Brock, TH, Albon, SD and Guinness, FE (1981) Parental investment in male and female offspring in polygynous mammals. Nature 289(5797), 487489. https://doi.org/10.1038/289487a0
Clutton Brock, TH (1991) The Evolution of Parental Care. Princeton, NJ: Princeton University Press.
Coates, J, Swindale, A and Bilinsky, P (2007) Household Food Insecurity Access Scale (HFIAS) for Measurement of Food Access: Indicator Guide. Washington, DC.
Cronk, L (1989) Low socioeconomic status and female-biased parental investment: the Mukogodo example. American Anthropologist 91(2), 414429. https://doi.org/10.1525/aa.1989.91.2.02a00090
Cronk, L (1991a) Intention versus behaviour in parental sex preferences among the Mukogodo of Kenya. Journal of Biosocial Science 23(2), 229240. https://doi.org/10.1017/S0021932000019246
Cronk, L (1991b) Preferential parental investment in daughters over sons. Human Nature 2(4), 387417. https://doi.org/10.1007/BF02692198
Cronk, L (2007) Boy or girl: gender preferences from a Darwinian point of view. Reproductive BioMedicine Online 15, 2332. https://doi.org/10.1016/S1472-6483(10)60546-9
Dahl, GB and Moretti, E (2008) The demand for sons. Review of Economic Studies 75(4), 10851120.
Das Gupta, M, Jiang, Z, Li, B, Xie, Z, Woojin, C and Bae, HO (2003) Why is son preference so persistent in East and South Asia? A cross-country study of China, India and the Republic of Korea. Journal of Development Studies 40(2), 153187. https://doi.org/10.1080/00220380412331293807
Du, J and Mace, R (2017) Parental investment in Tibetan populations does not reflect stated cultural norms. Behavioral Ecology 29(1), 106116. https://doi.org/10.1093/beheco/arx134
Ezer, T (2002) Inheritance law in Tanzania: the improverishment of widows and daughters. The Georgetown Journal of Gender and the Law VII, 599. Retrieved from https://heinonline.org/hol-cgi-bin/get_pdf.cgi?handle=hein.journals/grggenl7&section=27
Fayehun, O, Omololu, O and Isiugo-Abanihe, U (1997) Sex of preceding child and birth spacing among Nigerian ethnic groups. African Journal of Reproductive Health 15. Retrieved from https://www.ajol.info/index.php/ajrh/article/view/69625
Frempong, GA and Codjoe, SNA (2017) Sex preferences for children in Ghana: the influence of educational attainment. Journal of Population Research 34(4), 313325. https://doi.org/10.1007/s12546-017-9188-1
Gibson, MAM (2008) Does investment in the sexes differ when fathers are absent? Human Nature 19(3), 263276. https://doi.org/10.1007/s12110-008-9044-2
Grant, MJ and Behrman, JR (2010) Gender gaps in educational attainment in less developed countries. Population and Development Review 36(1), 7189. https://doi.org/10.1111/j.1728-4457.2010.00318.x
Guilmoto, CZ (2012) Son preference, sex selection, and kinship in Vietnam. Population and Development Review 38(1), 3154. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/22833863
Guilmoto, CZ (2015) Mapping the diversity of gender preferences and sex imbalances in Indonesia in 2010. Population Studies 69(3), 299315. https://doi.org/10.1080/00324728.2015.1091603
Hames, R and Draper, P (2004) Women's work, child care, and helpers-at-the-nest in a hunter-gatherer society. Human Nature 15(4), 319341. https://doi.org/10.1007/s12110-004-1012-x
Hamilton, W (1967) Extraordinary sex ratios. Science. Retrieved from http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.464.5709&rep=rep1&type=pdf
Harris, K, Furstenberg, F and Marmer, JK (1998) Paternal involvement with adolescents in intact families: the influence of fathers over the life course. Demography 35(2), 201216. https://doi.org/10.2307/3004052
Hartung, John, Abelson, Andrew E., Basu, Amitabha, Basu, Mahadeb Prasad, Beals, Kenneth L., Chiarelli, B., Curtain, Cyril C., Edwards, Charles Roy, Fix, Alan G., Korey, Kenneth A., Majumder, Partha Pratim, Mavalwala, Jamshed, Sharma, Abhimanyu, Szathmary, Emöke J. E. and Wood, Corinne Shear (1976) On natural selection and the inheritance of wealth [and Comments and Reply]. Current Anthropology 17(4), 607622. https://doi.org/10.1086/201799.
He, Q-Q, Wu, J-J, Ji, T, Tao, Y and Mace, R (2016) Not leaving home: grandmothers and male dispersal in a duolocal human society. Behavioral Ecology 27(5), 13431352. https://doi.org/10.1093/beheco/arw053
Hedges, Sophie, Sear, Rebecca, Todd, Jim, Urassa, Mark and Lawson, David W. (2018) Trade-offs in children's time allocation: mixed support for embodied capital models of the demographic transition in Tanzania. Current Anthropology 59(5), 644654. https://doi.org/10.1086/699880.
Hrdy, SB and Judge, DS (1993) Darwin and the puzzle of primogeniture – an essay on biases in parental investment after death. Human Nature 4(1), 145. https://doi.org/10.1007/BF02734088
Irwin, Alec, Valentine, Nicole, Brown, Chris, Loewenson, Rene, Solar, Orielle, Brown, Hilary, Koller, Theadora and Vega, Jeanette (2006) The Commission on Social Determinants of Health: tackling the social roots of health inequities. PLoS Medicine 3(6), 749751. https://doi.org/10.1371/journal.pmed.0030106.
Kaushal, N and Muchomba, FM (2018) Missing time with parents: son preference among Asians in the USA. Journal of Population Economics 31(2), 397427. https://doi.org/10.1007/s00148-017-0668-6
Keller, MC, Nesse, RM and Hofferth, S (2001) The Trivers–Willard hypothesis of parental investment. Evolution and Human Behavior 22(5), 343360. https://doi.org/10.1016/S1090-5138(01)00075-7
Khera, R, Jain, S, Lodha, R and Ramakrishnan, S (2014) Gender bias in child care and child health: global patterns. Archives of Disease in Childhood 99(4), 369374. https://doi.org/10.1136/archdischild-2013-303889
Kishamawe, C, Isingo, R, Mtenga, B, Zaba, B, Todd, J, Clark, B, Changalucha, J and Urassa, M (2015) Health & Demographic Surveillance System Profile: The Magu Health and Demographic Surveillance System (Magu HDSS). International Journal of Epidemiology 44(6), 18511861. https://doi.org/10.1093/ije/dyv188.
Klasen, S (1996) Nutrition, health and mortality in sub-Saharan Africa: is there a gender bias? Journal of Development Studies 32(6), 913932. https://doi.org/10.1080/00220389608422446
Lawson, DW and Mace, R (2009) Trade-offs in modern parenting: a longitudinal study of sibling competition for parental care. Evolution and Human Behavior 30(3), 170183. https://doi.org/10.1016/j.evolhumbehav.2008.12.001
Lawson, DW, Alvergne, A and Gibson, MA (2012) The life-history trade-off between fertility and child survival. Proceedings of the Royal Society B: Biological Sciences 279(1748), 47554764. https://doi.org/10.1098/rspb.2012.1635.
Leimar, O (1996) Life-history analysis of the Trivers and Willard sex-ratio problem. Behavioral Ecology 7(3), 316325. https://doi.org/10.1093/beheco/7.3.316
Mace, R (1996) Biased parental investment and reproductive success in Gabbra pastoralists. Behavioral Ecology and Sociobiology 38(2), 7581. https://doi.org/10.1007/s002650050219
Malipula, M (2016) Ethnicity, voting and the promises of the independence movement in Tanzania: the case of the 2010 general elections in Mwanza. Retrieved from https://biblio.ugent.be/publication/7897596
Maluccio, JA, Hoddinott, J, Behrman, JR, Martorell, R, Quisumbing, AR and Stein, AD (2009) The impact of improving nutrition during early childhood on education among Guatemalan adults. Economic Journal 119(537), 734763. https://doi.org/10.1111/j.1468-0297.2009.02220.x
Margulis, S, Altmann, J and Ober, C (1993) Sex-biased lactational duration in a human population and its reproductive costs. Behavioral Ecology and Sociobiology 32(1) https://doi.org/10.1007/BF00172221
Marlowe, FW (2003) A critical period for provisioning by Hadza men. Implications for pair bonding. Evolution and Human Behavior 24(3), 217229. https://doi.org/10.1016/S1090-5138(03)00014-X
McDaniel, A (2012) Women's advantage in higher education: towards understanding a global phenomenon. Sociology Compass 6(7), 581595. https://doi.org/10.1111/j.1751-9020.2012.00477.x
Ministry of Health, Community Development, Gender, Elderly and Children (MoHCDGEC) [Tanzania Mainland], Ministry of Health (MoH) [Zanzibar], National Bureau of Statistics (NBS), Office of the Chief Government Statistician (OCGS), and ICF (2016) Tanzania Demographic and Health Survey and Malaria Indicator Survey (TDHS-MIS) 2015–16. Dar es Salaam, Tanzania, and Rockville, Maryland, USA: MoHCDGEC, MoH, NBS, OCGS, and ICF, http://dhsprogram.com/pubs/pdf/FR321/FR321.pdf.
Murphy, R, Tao, R and Lu, X (2011) Son preference in rural China: Patrilineal families and socioeconomic change. Population and Development Review 37(4), 665690. https://doi.org/10.1111/j.1728-4457.2011.00452.x
Mutharayappa, R (1997) Son preference and its effect on fertility in India. Retrieved from https://scholarspace.manoa.hawaii.edu/handle/10125/3475
Mwageni, EA, Ankomah, A and Powell, RA (2001) Sex preference and contraceptive behaviour among men in Mbeya region, Tanzania. The Journal of Family Planning and Reproductive Health Care 27(2), 8589. https://doi.org/10.1783/147118901101195317
Nettle, D (2008) Why do some dads get more involved than others? Evidence from a large British cohort. Evolution and Human Behavior, 29(6), 416423. Retrieved from https://www.ehbonline.org/article/S1090-5138(08)00063-9/fulltext
Newport, Frank (2018) Slight Preference for Having Boy Children Persists in U.S., in Gallup: Social & Policy Issues. Retrieved from https://news.gallup.com/poll/236513/slight-preference-having-boy-children-persists.aspx.
Nikiforidis, L, Durante, KM, Redden, JP and Griskevicius, V (2018) Do mothers spend more on daughters while fathers spend more on sons? Journal of Consumer Psychology 28(1), 149156. https://doi.org/10.1002/jcpy.1004
Palloni, G (2017) Childhood health and the wantedness of male and female children. Journal of Development Economics 126, 1932. https://doi.org/10.1016/j.jdeveco.2016.11.005
Pashos, A and Mcburney, DH (2008) Kin relationships and the caregiving biases of grandparents, aunts, and uncles. Human Nature 19(3), 311330. https://doi.org/10.1007/s12110-008-9046-0
Pen, I and Weissing, FJ (2000) Sex-ratio optimization with helpers at the nest. Proceedings. Biological Sciences 267(1443), 539543. https://doi.org/10.1098/rspb.2000.1034
Quinlan, M and Quinlan, R (2005) Local resource enhancement and sex-biased breastfeeding in a Caribbean community. Current Anthropology 46(3), 471480. https://doi.org/10.1086/430017
Quisumbing, AR and Maluccio, J (2003) Resources at marriage and intrahousehold distribution: evidence from Bangladesh, Ethiopia, Indonesia, and South Africa. Oxford Bulletin of Economics and Statistics 65, 283327. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/1468-0084.t01-1-00052/full
Ross, CT, Borgerhoff Mulder, M, Winterhalder, B, Uehara, R, Headland, J and Headland, T (2016) Evidence for quantity–quality trade-offs, sex-specific parental investment, and variance compensation in colonized Agta foragers undergoing demographic transition. Evolution and Human Behavior 37(5), 350365. https://doi.org/10.1016/J.EVOLHUMBEHAV.2016.02.005
Royle, Nick J., Smiseth, Per T. and Kölliker, Mathias (2012) The Evolution of Parental Care. Oxford: Oxford University Press.
Schaffnit, SB, Urassa, M and Lawson, DW (2019a) ‘Child marriage’ in context: exploring local attitudes towards early marriage in rural Tanzania. Sexual and Reproductive Health Matters 27(1), 1571304. https://doi.org/10.1080/09688080.2019.1571304
Schaffnit, SB, Hassan, A, Urassa, M and Lawson, DW (2019 b) Parent–offspring conflict unlikely to drive ‘child’ marriage in northwestern Tanzania. Nature Human Behaviour 3, 346353. https://doi.org/10.1038/s41562-019-0535-4.
Sellen, DW (2007) Evolution of infant and young child feeding: implications for contemporary public health. Annual Review of Nutrition 27, 123148. https://doi.org/10.1146/annurev.nutr.25.050304.092557
Suitor, JJ and Pillemer, K (2006) Choosing daughters: exploring why mothers favor adult daughters over sons. Sociological Perspectives 49(2), 139161. https://doi.org/10.1525/sop.2006.49.2.139
Svedberg, P (1990) Undernutrition in Sub-Saharan Africa: is there a gender bias? Journal of Development Studies 26(3), 469486. https://doi.org/10.1080/00220389008422165
Trivers, RL (1972) Parental investment and sexual selection. In Campbell, B (ed.), Sexual Selection and the Descent of Man 1871–1971 (pp. 136207). Chicago, IL: Aldine. Retrieved from http://www2.nau.edu/~shuster/shustercourses/BIO698/Literature/Trivers 1972.pdf
Trivers, RL and Willard, DE (1973) Natural selection of parental ability to vary the sex ratio of offspring. Science 179(4068), 9092. https://doi.org/10.1126/science.179.4068.90
Veller, C, Haig, D and Nowak, MA (2016) The Trivers–Willard hypothesis: sex ratio or investment? Proceedings. Biological Sciences 283(1830), 20160126. https://doi.org/10.1098/rspb.2016.0126
Wells, JCK (2000) Natural selection and sex differences in morbidity and mortality in early life. Journal of Theoretical Biology 202(1), 6576. https://doi.org/10.1006/jtbi.1999.1044
WHO (2017) Children: reducing mortality. Retrieved 17 September 2018, from http://www.who.int/en/news-room/fact-sheets/detail/children-reducing-mortality
WHO (2018) Infant and young child feeding. Retrieved 17 September 2018, from http://www.who.int/en/news-room/fact-sheets/detail/infant-and-young-child-feeding
Williamson, N (1976) Sons or Daughters: a Cross-cultural Survey of Parental Preferences. Beverly Hills, CA: Sage. Retrieved from https://www.popline.org/node/465988
Zhan, HJ and Montgomery, RJV (2003) Gender and elder care in China. Gender & Society 17(2), 209229. https://doi.org/10.1177/0891243202250734

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Fathers favour sons, mothers don't discriminate: Sex-biased parental care in northwestern Tanzania

  • Anushé Hassan (a1), Susan B. Schaffnit (a2), Rebecca Sear (a1), Mark Urassa (a3) and David W. Lawson (a2)...

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