Hi!

My girls are both tummy sleepers too - the monitors are great and well worth the $ for peace of mind.
A close friend had similar issues after her babe was treated for jaundice with light and had been on his tummy in hossy from day1. She was advised to use the monitor but also they ran through a check of their SIDS risk - things like smoking in the house etc. to help put her mind at ease. May be worth checking with the PAED or some one suitably informed also???
She had a device to help wedge behind bubs back so they had some support too I think. Maybe your GP/Paed or MCHN may have more ideas....

Hope you get some sleep!!!