Best Formula Milk to Gain Weight

What's the best milk po for baby who's turning 11 months this April? I tried Lactum, Bonamil and Bear Brand pero lahat yan nagko cause ng matigas na pagdudumi sa LO ko. I wanna try another milk na hiyang po sa kanya. Any help? Thanks! PS: That's my cute little boy, Raijin! 😍😍