okay I need serious help

My newborn will not sleep at night unless she's on my husbands chest, which breaks like every rule ever. He pats her back & she falls asleep on him. So basically she's gonna be a stomach sleeper once she can roll over. But every time we go to put her in her swing or Rock n Play she wakes up. How do I get her to sleep on her back in her Rock n Play?! I can't keep letting this happen