Mummies how much milk should a 6 mth baby drink? How much water? Recently baby screams and arches back while crying, is that normal?

When your 6 month old baby is learning to use a cup, giving him a few sips of water a couple of times a day( no more than 60 ml) is fine and fun. Once baby starts solids, you might want to give him a few more sips of expressed milk or water with his solids. Some babies need this to prevent constipation.