Any ideas on how to help my three week old sleep on his back. He is extremely fidgety that he wakes up. He sleeps well in my arms and in his bouncer for a nap. But I’m finding that whenever I lay him down he becomes startled and awakes. He seems to be swallowing a lot too. I’m thinking maybe reflux? I currently have a rocking crib for him. Any ideas on what to do? Incline the mattress? See the go?