Carmey Bloom wrote in :

Hello,
I have a 4 1/2 year old son who is pottied trained but gets lazy and
doesn't want to poop in the toilet. He rather go in his pants and not
say anything about it.
[snip]

Is he perhaps a bit constipated? If you get him to sit on the potty
for a fairly long time (10-15 minutes) every day, with a book or
something to make it not-boring, maybe that would help?

--
Penny Gaines
UK mum to three