My 19 mo old drinks lots of water- maybe 8-16 oz a day & he is still breastfed. Are there any health concerns besides diabetes that might cause him to want so much water? He is small for his age, so I'm always worried that some little quirk may be an indicator of a health problem. He did have bloodwork because of his small size, including blood sugar level, and it came back normal. Maybe he just likes to be well hydrated.