How to get baby to keep paci in mouth???

Hannah • 💍 married in 2018. 🤰🏼due with our first 11/18! ✝️ loved and blessed by Christ.

My almost 6-week old baby doesn’t know how to keep the paci in his mouth. He wants it and starts sucking then if his head is turned it just falls out and he gets frustrated and starts crying. I’ve tried at least 3-4 different pacifiers so it’s not that. Is there a way to train him to suck harder so it stays in and doesn’t fall out so easily?