I don't know how we are going to switch my son to his crib in a couple of months because he sleeps…

I don't know how we are going to switch my son to his crib in a couple of months because he sleeps in his rock n' play and I get him most the way asleep by him laying on my chest but right when I lay him down he wakes back up again and he has to have the vibrater on until he falls back to sleep and if I don't turn it on he'll just grunt and move around, but after he's asleep I can shut it off and he'll stay asleep.