My son is 12 years old with a history of constipation. However he is having an extremely large bowl movement daily. About the size and weight of a twelve ounce coke can. Clogs the toilet daily. He does bleed but it's from the excessive large stool. The doctor said it was from constipation. Miralax is the option we were given. Does anyone else come across this? Am going to schedule a gastrointestinal visit. But anyone come across this? My son is also autistic and is not very kind to doctors. Does not like to be touched and its usually a fight. Big boy 5 feet and 160 pounds.