General newborns can not feed plain water, but if the baby is sick, fever, you can feed the baby a moderate amount of plain water to replenish the body’s water, to prevent dehydration and electrolyte balance disorders. Newborn babies to eat breast milk or formula-based, both breast milk or brewed formula in the water content, up to 90% or so, has been able to meet the baby’s daily growth and development of water needs, and breast milk osmotic pressure changes regulated by the blood, so basically can guarantee breast milk osmolality and plasma osmolality inhibition, and formula is also as close as possible to the breast milk osmolality, so it does not Stimulate the baby to produce the feeling of thirst, and there is no need to give the baby extra water. Coupled with the baby’s limited digestive ability, if you give your baby extra water, it will affect the baby’s normal amount of milk, but also aggravate the burden on the baby’s kidneys.