Sleep training

I've been sleep training my bug this last week. He recently only wanted to sleep while he was carried and sleeps in bed with me. (Yeah I know increase risk of SIDS; but when he was a newborn his temperature kept dropping so I had to be skin to skin with him a lot) anyway bad habits we are trying to break (6 weeks) my babes is so good he's picking up on napping in a crib only has to by gently rocked and goes right back down and tonight slept 4 straight hours in his crib after our bedtime ritual. Anyway! I was looking at old pictures of when I brought him home and almost instantly wanted to go wake him up to put him on my chest to sleep! 😢😭 I think this new sleeping arrangement is harder for me then babes