Nan formula stage 3

I buy the normal one without HA. HA is hypoallergenic, meaning gentler on the stomach for little ones with sensitive stomachs (think the milk proteins are broken down more easily). But since I’m going to transition to cow’s milk (which hs complex proteins) after some time, and since my LO does not have any allergies, I feel it’s better to transition from normal optipro to cow’s milk