My lo currently 6mo( corrected age is 4mo), this few days his lip cracked and will bleeding when he cry,is it the sign of dehydration?im fully breastfeed him so it means that he not getting enough breastmilk?im seldom give him water because hear that fully breastfeed baby don't need water.So should i give him some water or just apply lip balm like vaseline on his lip?