No healthy child will dehydrate themselves in the presence of breastmilk and formula. Breastfeeding is a dynamic process - changing all the time. Wish I had a dollar for every mother who came to me after they weaned "cold turkey" at 10 months because they "knew they had no milk" only to find themselves engorged and on the verge of mastitis a day or two later. Your little one needs food and water (yes, they just play in the water most of the time) Let your baby take the lead and relax a bit.