How often should a 2.5 yr old urinate in a day?

Huh? As often or as much as needed? It's a input output balance thing by homeostasis. Urinate too little could be dehydrated, not enough water, urinary track problem. Too much also urinary track problem, or drink lots of fluids stuff. There's no gauge

I think both mummies have already answered your question. If you're worried that your kid is not peeing enough, check the pee. Is it dark and very concentrated? If yes, then he is dehydrated and needs to drink more.

Ermmm... There is no answer to that. Its like asking how many times an adult should urinate a day. It deoends on how much you drink and go whenever you need?