Need advice please. My baby boy is 1 week and 3 days old. Every time when he falls asleep I put him on his back and he wakes up and cries like he is not comfortable. So I pick him up and he lays on my chest and falls right back to sleep. So I try put him down again and he makes noises and wakes up again. So today we put him on his belly to nap on the couch and he did not wake up or anything. He slept so good! I am just scared about sids. Should I be worried? Can I let him sleep on his belly or no?