Please suggest which formula milk is best for my 4 months old baby.

Enfamil A+ is a popular choice among mummies as it contains DHA and ARA which are important nutrients for eye and brain development. It also contains choline(promote overall mental development), GOS(prebiotic) as well as vitamins C and E. Other popular brands which you can consider are NAN, Similac, Mamil Gold or Friso Gold http://sg.theasianparent.com/the-6-best-infant-formulas-shopping-guide-special/