Getting them to sleep

Cait 💍🤱🏼💑👧🏼👧🏼👦🏼

My little guy was 6 weeks early and is almost 3 months. He used to be so easy to put to sleep, lay him down swaddled and sleepy and he'd just drift off. The past week has been work to get him to sleep. Swaddle, rocked, fed ect. Every trick in the book and he still will cry himself to sleep (no I just don't let him cry, I go back and put the paci in and shhhh him and rock the rock n play) any ideas? I'm afraid the ease of the NICU is wearing off lol.