K.M.
I think its just spurts that they go through, I have two little ones but my youngest is a month old, she has always been a really good eater but for the past couple days she doesnt seem very interested in eating. Just a little here and there is enough to satisfy her right now. I wouldnt worry too much about it as long as he is not dropping a ton of weight and doesnt seem hungry.
My little one is a grunter, she grunts through the entire time she is sleeping. Sometimes she gets so loud she wakes herself up. I swaddle also and sometimes she just doesnt want it and wiggles so much she gets her arms out. But once they are out if she moves at all it wakes her up because her movements are still jerky. Maybe try different positions, when my first was done with the swaddling he was most comfortable on his tummy. Then his arms wouldnt jerk around and wake him up. I know they say not to lay on the tummy but as long as they dont have blankets up past their bottom and a extra stuff in the crib/bassinett I didnt see the problem.
Try giving him a bath right before you are going to go to bed. Rub him down with lotion in a massaging way. Works wonders with mine.
Congratulations on your little one! good luck.