Thank everybody for your reply. PLS somebody help me with the si

If it is infection,why does he get it so easily? The new doc is going to do a morning test in 3 weeks. But two docs told us it is normal to find a little blood in urion in active kids. I am so confused. We give him bath insteas of shower. Could this be the reason.He complains about tummy ache after dinner almost everyday this month.thanks again.