What am I to do?

Michelle
So my week old baby doesnt like laying on his back...we either have to put him in his boppy or hold him...I think its bc his grandma holds him the entire time shes with him. What are we to do. Im trying to let him cry it out but I feel like thats not working. He was asleep in my arms for 30 min and as soon as I put him down in his pack and play he started crying. So far hes been crying for 20 min.