Transitioning to crib!?

Brittany • Daxton 12-17-15 & Eli 9-29-21 🤍
Anyone have some advice on transitioning to crib? My baby is 4 months old on Sunday & has always slept in his rock & play sleeper but his feet are beginning to hang off 😂 and when I put him for naps in his crib he flinches a lot, pulls his feet up and wakes up within minutes and cries 😓 I'll try anything!