Differences among languages offer a way of studying the process of infant adaptation from broad initial capacities to language-specific phonetic production. We designed analyses of the distribution of consonantal place and manner categories in French, English, Japanese, and Swedish to determine (1) whether systematic differences can be found in the babbling and first words of infants from different language backgrounds, and, if so, (2) whether these differences are related to the phonetic structure of the language spoken in the environment. Five infants from each linguistic environment were recorded under similar conditions from babbling only to the production of 25 words in a session. Although all of the infants generally made greater use of labials, dentals, and stops than of other classes of sounds, a clear phonetic selection could already be discerned in babbling, leading to statistically significant differences among the groups. This selection can be seen to arise from phonetic patterns of the ambient language. Comparison of the babbling and infant word repertoires reveals differences reflecting the motoric consequences of sequencing constraints.