Studymum - DS1 is the same as your DD1, he doesn't worry about a pooey nappy; that's why I was worried about DS2 screaming. They are all so different and like to keep us guessing.

Helle - Good idea. He does get some water with mealtimes, but I haven't been giving him too much because I don't want him to cut down on BF. I will try giving him more water.
He shouldn't do... DS drinks a about 180-200ml a day of water and is still a booby machine! He'll know what he wants