Good morning girls. I can't understand what it could be related to... …

Good morning girls. I can't understand what it could be related to... The child after night sleep has had very little bowel movement... Refused to drink formula at night (if you will be more precise, he didn't ask for it) earlier at night 1-2 times he drank... Could dehydration occur because of this and what should I do? He used to have such small bowel movements only when it was very hot outside... Won't drink water and even without sugar juice he doesn't drink... Now I am worried.