4Month won't sleep in crib

Brian
Hey everyone -
Our son is almost 4 months old and we can't get him to sleep in crib. He started in Rock & Play and is now in a swing for sleep. He sleeps in swing right next to crib in his room. Any advice on how to successfully make the transition? He wakes immediately in crib. We have even proper up on side of the mattress with towels and made a towel ring beneath the sheet to keep him feeling more snuggled. Still no luck.