Quoting White Chocolate Milk:" Newbs like the comfort of mommy. The smell, the warmth, and being able to hear your heart. Try swaddling ... [snip!] ... that tight comfort like the womb. Some babies do prefer their tummies but I would still try and keep him on his back for now."
This!!! You honestly can't expect something that has spent 9 months inside of YOU to just come out and be self sufficient and not need your comfort to sleep. All Lo has known is your heart beat your breathing and so on and so forth.