new kitten questions

[gabybe]

Hi everyone
i have a new kitten, my first Maine coon - he is called Binksy and is 13 weeks old and gorgeous but i am worried about him - i got him 3 days ago and he seems to have settled well, he eats drinks and uses his litter tray appropriately BUT he sleeps all the time and never wants to play - can this be normal at his age shouldnt he be running about driving me insane LOL - he has the usual fat tummy but i can feel all his little bones - he looked the same as his brothers and sisters although i didnt pick any of the other up. He has been wormed a few weeks ago and has 2 vaccs although not leukemia yet
thanks in advance for your help