What to do about constipation in 3 year old? 3 year old doesn't want to use potty---holds it. Is taking miralax (polyethylene glycol) daily. Eats fiber bars. Doesn't like apple juice. Is constipated. Rectal suppository not working.

More miralax (polyethylene glycol) Talk to your doctor, but if she is still constipated on MiraLAX (polyethylene glycol) she may need a higher dose of miralax (polyethylene glycol). If she is eating fiber bars make sure she is drinking plenty of water. She should also sit on the toilet for at least 15 minutes after each meal. Get her a foot stool so it is more comfortable to sit on the toilet that long. If all that doesn't help, she should see a pediatric GI doctor.
It . It sounds as though you are trying many of the common tactics we recommend. Since he is taking daily MiraLAX (polyethylene glycol) and fiber without good results, it may be time to consult with a pediatric gastroenterologist. Ask your child's doctor for a recommendation to someone they know and like. It is important to rule out a medical cause for his constipation. Good luck!