My 4 year child is feeling need for frequent urination and his urine was orange in shade when we took him to the toilet the last time. He also has been wetting his underwear for the past few days even though he is potty trained since the age of 2. He also has the habit of holding up urine for long. Today, he is also not active as usual. Are these signs of UTI? If yes, is there any Over the counter medication we can take?