MILK FORMULA

Hello mga momshie I'm asking of your opinion if what formula milk is the best for increasing baby weight ? my baby is now @her 7months old and she's only weighing 7.5 kls..we used SIMILAC of her first 3 months then we shift to S26 GOLD 4 months until now.. bit still she's PAYAT and super likot... I'm planning of changing to other formula like bonamil and lactum.. for you mga momshies which is which ang maganda?