my kitten has not pooped in 3 days

[damientrueblood]

I recently caught a kitten in my backyard from the wild it was born in my neighbor's backyard. it took a little while for the kitten to get used to me too I had the kittens for about 4 days now and as not use the restroom yet it has gone pee eats and drinks but I can't get it to go take a poop. I have no idea what's wrong any advice would be helpful thank you.