Growth and nutrition during immaturity are being viewed with renewed interest because of the possibility that they may be linked to cardiovascular and metabolic health in after life. Of particular interest are differences between bone- and formula- fed babies with regard to nutrient input and growth because breastfeeding has been shown to be associated with a reduced threat of rotundity in after life. During the first 6- 8 weeks of life there’s little difference in growth (gain in weight and length) between bone- and formulafed babies.Still, from about 2 months of age to the end of the first time of life formula- fed babies gain weight and length more fleetly than bone- fed babies. There are no harmonious differences in obesity during the first 4- 5 months of life, but during the after part of the first time of life the transcendence of the substantiation suggests that bone- fed babies are slender than formula- fed babies. Formula- fed babies at 4- 5 months of age show advanced tube situations of insulinsuchlike growth factor- 1( IGF- 1), insulin and certain amino acids than bone- fed babies [1]. Whereas the protein input of bone- fed babies decreases with age and nearly matches the conditions for protein during the early months of life, the protein input of formula- fed babies exceeds conditions after the first 1- 2 months of life. The data are harmonious with the thesis that differences in protein input are substantially responsible for differences in growth between boneand formula- fed babies. Differences in energy input presumably are responsible for differences in obesity observed in aged babies