Work out the baby's water intake via their body weight in pounds, divide this by 2 and they should be taking this amount in Ounces a day. Milks etc do not count as water and drink, milk is a food. I would then suggest following Dr.Fereydoon Batmanghelidj's information on Salt, use only Himalayan, Hawaiian, Celtic or any other unprocessed high mineral salt for balance (Himalayan = 83 minerals stable). If this is adminstered properly to the child the problems will disappear. I also suggest you bath the child in salt baths regular and watch the results ;-)
If you study on Batmanghelidj you will be amazed at how such a simple thing as salt can do these amazing things, again it must be proper salt NOT table salt.