My kitten is 4 months old and he is the sweetest thing - really affectionate and always wanting to be near me and when he plays with me he doesn't put his nails out and he purrs a lot. But in the last couple of weeks he is increasingly starting to nip me. I think it is to get my attention or something. He did it a bit when I was preparing his dinner on the bench but now he does it just when he is lying next to me or rubbing against me. Do you think it is just an attention thing?