What are the common causes of constipation in infants

“The causes of constipation in infants can be divided into organic constipation and functional constipation.
Organic constipation is caused by specific conditions, such as congenital megacolon, enteric neuronal dysplasia and congenital hypothyroidism.
The causes of functional constipation are complex and some of them are still not fully understood, but are usually related to a variety of factors such as diet, genetics, structural and functional abnormalities of the gastrointestinal tract.”