Infant Formula Supplemented With Probiotic Microorganisms and/or Prebiotic.

Inclusion Criteria: * Healthy term infants of both sexes, born in natural labor . * Single birth. * Full term infants (born between the 37th and 42nd week of gestation) * Infants with birth weight \>2500 g. * Recruitment age will be 0-21 days. * Infants whose mothers are unable to breast feed or have chosen not to breast feed prior to the study enrollment. * Infants whose parents have agreed to participate in the study up to the age of 9 months.. * Infants whose parents have agreed to remain exclusively on the same product for 16 weeks of age.. * Infants whose parents have signed the informed consent form. * Infants whose parents are able to understand the protocol requirements and to fill out the infant's diary and agree to completely fill out the parents' questionnaires during the period Of 9 months Exclusion Criteria: * Twins. * Premature or low birth weight (\< 2500 g). * Chromosomal abnormalities or congenital malformation. * Suffering jaundice which require phototherapy. * Proven or suspected family history of allergy to cow's milk. * Having been treated with antibiotics or other drugs during the last three days or more prior to the commencement of the study.