stage 1 is slightly expensive than stage 2 . even with S26 every FM brand can see the difference in cost stage 1 is 0-6 m stage 2 is 6 m onwards then if I'm not wrong when they're 12 m then change to stage 3 .. this is all step by step FM . added nutrition etc etc
cost difference. stage 1 is easier to digest, but not compulsory to change. stage 2 is slightly cheaper. some babies experience constipation after changing to stage 2 due to formula change
the amount of nutrient is different..as they grow older and start on solids, the higher stage have lesser eg. vitamin, iron etc because they get their nutrients from solid food..
stage 2 doesn't have L carnitine
Angelina Terence