What is the ideal baby formula brand out there for 7months plus baby? Now slowly letting my son to try friso stage 2. Whats the difference between the many brands out there?

I believe every different milk powder benefit the babe. but the key word is are our baby able to accept the milk / taste . or some baby might have constipation. . my both kids are on friso . they both like it and will just stay with friso .