Tips on getting baby to sleep on her back?

I had to switch to formula about a month ago because of breast milk supply issues. Since then, my now 2 month old started having tummy issues. Now I cannot get her to sleep on her back anymore! If I lay her on her back, no matter how gentle or careful I am, she is up crying within 5 minutes. Even now that we found a formula mixture that seems to agree with her, she still won't sleep on her back.I'm extremely nervous about having her on her stomach unless I'm around to watch her. Otherwise I'll have her sleep on my chest. But I am an extremely light sleeper myself and I cannot sleep while she is on my chest! I only get about 2-4 hours a day when my fiancé gets home from work. I am losing so much sleep over this.It's the same if I swaddle her. She's fine on her stomach but wakes up if put on her back. I've also tried lying her on her back with her head elevated but that doesn't work either.Any advice?? I need more sleep! via /r/Parenting http://ift.tt/2vR86za