I don't want to seem disparaging to your regular average porcupine baby, but I've gotta say... the coendou's trademark tail really gives them an edge in the squeeness department!
This is my baby named Teddy-Bear. The first pick is of him on the day we brought him home (at about 12 weeks old) sleeping next to a toy cat I have. The second is of him with the same toy in August this year, just a few months short of his 5th birthday. I can't believe he used to be that small!! <3 :)