My Toddler is Not Urinating! - Reasons, When to Worry ...
1. Slight dehydration. Maybe your toddler has peed, but not enough for you to discover. This could happen if your toddler has been active, and he hasn’t drunk enough. Of course, by saying this I assume that your toddler still wears diapers. Diapers are very effective in absorbing urine, and small volumes of urine can easily “disappear”.