evidence: The video, posted by Dr Karan Rajan, a surgeon, clinical lecturer and medical influencer, starts with the statement "do not give [babies] water to drink until they're six months old because it could be fatal" before going on to explain the potential issues around overhydration. [...] The NHS says: "Formula fed babies under 6 months of age may need small amounts of cooled boiled water during hot weather as well as their usual milk feeds" as well as advising the same as a treatment for constipation in formula-fed babies in general. [...] We also contacted the Mail about their headline: "This is why you should NEVER give babies water", and were told the headline is reporting on Dr Rajan’s claim while the piece is clear about the context on when babies should and should not drink water.