Napping in crib milestone

Omg. I’ve been trying everything to get my LO (almost 4 months) to nap in his crib.. he sleeps with me at night (in a co-sleeper) and is a great sleeper, but he’s outgrowing that and I need to transition him to the crib. Every time I set him in there he’d wake up right away. Someone told me it’s because they can smell their mom isn’t around.

So today I laid my pillowcase I’ve been using for the last 2 weeks down flat in the crib and laid his head on it. He’s been sleeping for 3 hours. So happy. Just thought I’d share! I also put his sound machine in there 👍🏼