<prompt> Organic causes of constipation in infant are all except a High fibre dietb Cystic fibrosisc Hypothyroidismd Hyperthyroidismbcacad  <response>: Constipation in infants and childrenConstipation is extremely common in pediatric population. The vast majority of cases 90-95 are functional i.e. 90-95 have functional constipation with no organic disease. In 1-5 cases, the organic disease can be diagnosed as cause of constipation, i.e. only 1-5 have organic causes of constipation.Organic causes of constipation are:Intestinal: Hirschprung disease, Analrectal stenosis, Anal fissure, anteriorly displaced anal opening, strictures.Drugs: Narcotics, vincristine, Psychotropics.Metabolicendocrine: Cystic fibrosis, hypothyroidism, Panhypopituitrism.Neuromuscular: Cerebral palsy, Psychomotor retardation, spinal cord lesions, Myotonic dystophy, Neuropathy or myopathy of GIT.Other causes: Low fibre diet, Milk protein allergy. 