I can only tell you this... always go with your gut... if you feel he's not getting the attention he needs b/c he's just being left laying around... do whatever you have to do... to find another more stimulating environment. You never get another chance...
if he's getting a bald spot and he never had one before... they get those because as they get more able to control their heads and they want to look around... My son had one for a brief time... but it went away... But the flat head thing.. if nothing else, call your pediatrician and leave a message to talk to his nurse and get her opinion on it...
If the spot was bothering him at all.. do something ... it's never too late...
I would DEFINITELY bring it up to the daycare that he's getting flat head and they need to rotate him around more... sides, etc.
Don't leave it up to the pediatrician though to say something ... if you're concerned... you bring it up! You're th emom and YOU know best!
I wish you the best of luck... I feel so fortunate to be a SAHM sometimes... and wish I could help you out but I don't know any child care facilities in your area...
Good luck!