Best Way To Incline A Crib How Can I Incline The Crib To 30 Degree Angle For Reflux Baby, Without The Baby Slipping Downwards?

How can I incline the crib to 30 degree angle for reflux baby, without the baby slipping downwards? - best way to incline a crib

8-weeks, my baby has reflux and I recommended to tilt the cradle. I've tried, but the child slipped down to the foot of the bed. How can I avoid this?