evidence: While it seems unnatural to not provide water to your little ones early on, there’s legitimate evidence as to why babies shouldn’t have water until they’re about 6-months old. [...] Giving your baby water before six months isn’t recommended for the following reasons. [...] Your baby may be ready take their first sip of water at six months. However, it’s important to realize that newborns, infants, and toddlers have very different hydration than from adults.