Querky kitten

Question
 Well, my male kitten(I believe he's a Ragdoll) is quite messy ! He buries his ENTIRE face in his food when he eats. It's gotten better over time, but he's still a mess everytime he eats.
 F.Y.I.- He is 11 weeks old & has been weened for 6 weeks(I've had him since he was 7-10 days old)
He sits full on his butt when using the litter box, which makes a mess on his rear end.
 Also, he throws up once a day everyday since he was weened. I feel like he just overeats & his little system can't take it, because he's perfectly fine otherwise.
 My vet said he may be retarded. I'm not sure if his mother abandoned him or what. My boyfriend manages a Petco in L.I. & someone brought him in saying she found him on the corner. I have a hard time believing that though as he was fresh, clean, smelling good & had a bottle of milk with him, so I think that maybe the person who "found" him actually owned him but got sick of him & couldn't handle it anymore(he is high maintainance & cried ALL THE TIME when he was a new born & needed to be held 24 hrs. a day).
 My questions are :
1) Why does he bury his face in his food ?
2) Why does he throw up once a day, everyday ?
3) Why does he sit full on his butt when he uses the litter box ?
4) Will all this stop eventually ?
5) Should I be worried ?
6) Is this normal hand raised , possobly retarded kitten behavior ?
7) Should I take him to the vet ?
Can you help me with my questions ? It would be much appreciated !
Thank you !!!

- SARAH JOHNSON  

Answer
1) Why does he bury his face in his food ? Im not sure

2) Why does he throw up once a day, everyday ? give him some catlax

3) Why does he sit full on his butt when he uses the litter box ? he is still a baby

4) Will all this stop eventually ? possibly

5) Should I be worried ? nah

6) Is this normal hand raised , possobly retarded kitten behavior ? yes

7) Should I take him to the vet ?yes