Does your sister-in-law say why she thinks he's constipated? If it's on the basis of what his stool looks like, here's a chart with drawings (not photos) of the 7 types of stool. Types 1 and 2 are formed but constipated. Types 3 and 4 are healthy, formed stools. Types 5, 6 and 7 are loose, watery stools.
http://www.familydoctor.co.uk/htdocs/BOWELS/BOWELS_specimen. html
If it's on the basis of behavior, such as arching his back or pushing against objects with his belly, you might want to talk to the pediatrician about it.
According to one study, autistic children can be constipated without showing the usual signs. They concluded that the severity of constipation (for example megarectum) was hard to predict from the usual indicators of stool frequency, soiling, abdominal pain, etc. A radiograph was more accurate.
http://pediatrics.aappublications.org/cgi/content/abstract/1 12/4/939
Good luck with everything.
Thanks Shell,i would say three days
adul;t or child
after a couple of days poo starts to fement inside the gut
it then causes poo leaks even though the child has not tryed to poo.
try giving brown bread and juice and fruit
a sign to look for for constipation is swelling of the belly and a pasty look.
hope this helps love shell
I know this is going to sound silly but how to you know if your child has gut issues?