Artificially fed or mixed feeding babies are allowed to add boiled water.
If the baby is exclusively breastfed, then this situation can not need to add boiled water, because breast milk is more than 95% of the water, purely drinking breast milk can already let the baby get enough water.
But if the baby is artificially fed or mixed feeding can add another boiled water. Because of the formula compared to breast milk, the baby is not easy to digest.
It is recommended to add a little bit of boiled water in between two meals of formula milk to minimize constipation, bloating and other symptoms.
It is recommended that you take your child to the hospital for regular health checkups, and if your child is unwell at any time, you should seek medical attention as soon as possible.