5 week old kitten not pooping

Hello, I have a kitten who is not pooping, or I haven't ever seen him poop in his 5 weeks of life. My cat gave birth to 2 kittens but one of them died due to the fact her intestine had developed outside of her body. She died 24 hours after birth. The other kitten surviuved but now he isnt pooping. He pooped once, that i can remember of and that was when he was just born. After that i havent seen him poop even when stimulated. I am concerned about his well being, but over all he is eating, playing and a happy kitten.

Hello!  This is very curious.   I am pleased that your kitten is well and happy and bright; this is an important sign in kittens.    Usually by now I would have expected some bowel movement; could the Mum cat be eating them?   It is worth a check up with your vet to be sure that everything is okay.