Walter Cook

“Some infant formulas are enhanced with docosahexaenoic acid (DHA) and arachidonic acid (ARA). These are essential fatty acids found in breast milk and certain foods, such as fish and eggs. Some studies suggest that including DHA and ARA in infant formula can help infant eyesight and brain development, but other research has shown no benefit. In addition, in an effort to mimic the immune benefits of breast milk, some infant formulas now include probiotics — substances that promote the presence of healthy bacteria in the intestines. The data on probiotic-supplemented formulas is limited and”
― Walter Cook, Mayo Clinic Guide to Your Baby's First Years, 2nd Edition: Revised and Updated

“Infant formula is generally recommended until 1 year of age, followed by whole milk until age 2 — but talk with your child’s medical provider for specific guidance. Reduced-fat or skim milk generally isn’t appropriate before age 2 because it doesn’t have enough calories or fat to promote early development. Experts recommend weaning your baby from a bottle to a cup by no later than 18 months.”
― Walter Cook, Mayo Clinic Guide to Your Baby's First Years, 2nd Edition: Revised and Updated