Feeding Infant Formula With Added Probiotics and Whey Protein Concentrate

Inclusion criteria (formula-fed group): healthy infants of mothers who could not or voluntarily resigned completely from breast-feeding at infant age 14 plus/minus 3 days Inclusion criteria (breast-fed group): healthy infants exclusively breast-fed from birth and mothers intending to breastfeed \>80% until at least 5th month of age (meaning through the 4th month of age). Inclusion criteria (all infants): delivered between 37 and 42 weeks of gestation birth weight \>2500 g and \<4000 g parent or the subject's legal representative speak and understand Chinese Exclusion criteria (formula-fed group): fully or partially breast-fed infants infants breast-fed \>20% Exclusion criteria (breast-fed group): infants fed \>20% infant formula Exclusion criteria (all infants): malformations, handicaps or congenital diseases that could affect normal feeding or growth treatment with antibiotics