Advice please - is clearly in discomfort when trying to poo. Trying can take couple of hours and is then a poo of volcanic proportions - a poocano! He is mix fed about 70% bottles and 30% breast. Is a good burper after feeds. Generally content other than the poo. Have massaged tummy and made sure my diet not spicy.
Everything I've read says bottle fed babies may need water in very hot weather but would not need it otherwise. Neither of mine had any until they started solids. Formula is predominantly water anyway.