We have a 2 week old kitten that was not excepted from hi smother at birth, so we took him in. He pooped a lot on Thursday, but he didn't go yesterday or today. I have already used a thermometer and petroleum jelly up his bum for stimulation, the warm paper towel method, messaging his belly, and rubbing his bum with a paper towel covered in petroleum jelly. He still won't go. What other methods can I do?