evidence: Introduce your baby to drinking from a cup or beaker from around 6 months and offer sips of water with meals. [...] Once your baby has started to eat solid foods (from around 6 months) you can offer them sips of water from a cup or beaker with meals. Drinking water for babies over 6 months does not need to be boiled first. [...] Formula fed babies under 6 months of age may need small sips of cooled boiled water during hot weather as well as their usual milk feeds.