I need urgent help my 3yr old son dont want to go to toilet and his stool very hard comes out like small balls and he struggles go out in toilet help?

Need oral laxative?: Each child with constipation needs to be sure there is no other disease causing it. A pediatrician's evaluation is needed. We do not want a child to get chronic constipation. If constipation is due to slow movement of food and poop through the gut, then things to try are vegetables, water, prune juice, prunes, fiber-plus-water, Miralax (polyethylene glycol), senna extract, milk of magnesia, etc...