My kitten is 3 weeks and 5 days old. He has been doing very well. he eats and sleeps alot and plays...however he doesnt poop...he didnt about the first week i had him ...he was abandoned and we found him at a couple days old...then he did it was likestuck on his fur and after that it was hard....i tried veggie oil...but since then he hasnt pooped its been a week..he seems to being doing great...i cant afford a vet bill he was an unexpected but happy gift and iv spent too much already. What should I do...like i said he seems to be doing great! should I worry? please help!