The baby should only be fed breast milk for the first six months since breast milk contains an adequate amount of water. Breast milk has a water content of over 80%. Start nursing the infant even while they are having hiccups, and then properly burp the child for at least 8 to 10 minutes. (A baby under six months old should never be given water to relieve hiccups.)
Now let’s talk about the why?
Up to the age of six months, a baby’s kidneys cannot handle water. In general, water can disrupt a baby’s electrolyte balance for infants less than 6 months, which can ultimately result in seizures. A baby who becomes intoxicated by water runs the risk of having serious health consequences and having their growth and development stunted. Consequently, six months is the recommended age for introducing water to a newborn (at that time, you should still only offer your baby a little bit of water). But as your child gets older, his or her kidneys develop.
It might also be unhealthy to add too much water to baby formula. Always stick to breast milk or correctly prepared infant formula to prevent these issues.