Excessive Thirst More Condition_symptoms What Could Be The Cause Of My Toddler's Excessive Thirst?

What could be the cause of my toddler's excessive thirst? - excessive thirst more condition_symptoms

My daughter is 15 months thirsty all the time. Let me tell you a cup of juice, milk, water, etc. and the cup at a time to drink. He also tried a drink for all drinks all the time. My mother said that this may be diabetes, and there are two sides of his family. Is there anything else that could do this? The temperature of the body seems always hot and perspire a lot, but his father was, and remains so. We live in Houston and the time was over 100 degrees, so the reason could be that? I just wanted to know if I would call the doctor.