It is not normal for a child to pass bowel movements that clog the toilet. A normal poop for a child should be a long smooth, snake-like bowel movement that is easy to pass. If your child is passing large thick stools that hurt them and clog the toilet, they are constipated.
Antibiotics can disrupt your child’s gut microbiome and cause constipation. You can help them to repopulate their gut bacteria and have normal bowel movements again.
If your 5 year old is constipated there are things you can give your child at home, like magnesium, that will help them to have a bowel movement quickly.