i am not a big fan of juice for babies (unless they are having problems with true constipation). when they start eating solids well you can give a little "pure" juice (not sugar-water flavored). fruit is better after about age six months. most of the time they do not need more water than what they are getting in breast milk or formula. if is hot outside it's okay to give a little water. it won't hurt them but you don't want them to fill up their little tummies with water to the point where they won't take nourishment.
what age can a baby start drinking water and juice?