Please do not feed your LO water no matter what they say. Milk is sufficient. He's only 2 mths. Give him time to gain some weight. My babies only started gaining weight around 3 mths. Can really see the chubby cheeks. You do you, Mummy. You know the best for your LO. Ignore all the negative comments. As long as your baby is healthy and drinking milk, that's all matters.