Lay on stomach?

Stephanie • Graduated from Western Michigan University 14' . Successful and beautiful. Mom to a 9 year old son. Due 1/27/16.
My one month old is REALLY fussy if he lays any other way EXCEPT when you lay him on his stomach. I read about sids and stuff so I know it's not the best but he only really will fall asleep on his stomach . Can anybody relate? Is something wrong with him?