 [ Symptoms ] what age can a baby start drinking water and juice [ Disease ] 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 is okay to give a little water it will not hurt them but you do not want them to fill up their little tummies with water to the point where they will not take nourishment