DS is nearly 5 months old and was exclusively BF for 3 months but I gave up when he wouldn't keep much down and constantly wanted fed. He now gets a special Aptamil Easy Digest for comfortable digestion and is much more satisfied as he doesn't throw it all back up.
The problem is that I have read that formula fed babies need water to keep them hydrated unlike BF babies. I have tried giving him water from a bottle but he wont drink it and just ends up getting upset when he realises its not milk.
Any advice? Also how much water do they need?