Side sleeping

Alexa • Micah Tyler born 08/31/17 💙
My son is 12 weeks and is fighting to sleep on his side! It worries me obviously because they're supposed to be on their backs only but lately no matter what he turns onto his side and cranes his neck backwards so his head is totally curved it just looks so dangerous. I've been moving him back to his back but within minutes he's on his side fussing and looking uncomfortable. Idk what to do because it's making it really hard to put him to sleep, for both of us. I should mention he sleeps in a rock and play type sleeper so it's hammock style and that's why his side sleeping worries me. Although it has mesh sides. He's not ready for his crib yet but this is stressing me out. Does anyone else have a side sleeper or a sleep rule breaker?