THE FORMULA OF THE INVENTION, INTENDED BOTH FOR INFANTS AND YOUNG CHILDREN, COMPRISES PROTEINS, PREFERABLY MODIFIED SWEET WHEY PROTEINS FREE OR ALMOST FREE OF CGMP, AND AT LEAST ONE PROBIOTIC. THE INVENTION ALSO PERTAINS TO METHODS FOR PROMOTING PHYSICAL DEVELOPMENT, METHOD FOR IMPROVING GASTRO INTESTINAL COMFORT, AND METHOD FOR DEVELOPING A HEALTHY GUT MICROFLORA IN INFANTS OR YOUNG CHILDREN BY FULLY OR PARTLY FEEDING THEM WITH THE AFORE-MENTIONNED FORMULA.