Holly is a female African Pygmy Hedgehog. She weighs about 463g and was born May 28, 2019.
I would monitor him carefully, he is probably just stressed or unsure of his new environment. If you are worried, you can give him some pumpkin, this helps with constipation and diarrhea. I've used it if my hedgie just seems a little under the weather and it seems to work well. You can also try a warm bath, a bit gross, but this can encourage them to poop as well.