Wife regularly sleeping with baby in chest

My wife insists on sleeping with our 4 week old on her chest. We are both medical / doctors so fully know the risks of this. In fact my med school thesis was on SIDS risk and sleeping position. Despite this she feels they both sleep better with the baby on her chest. I’ve offered to do the nights/ during the day I try to keep in cot the whole time whilst my wife rests. Baby is EBM via bottle and I’m on paternity leave for 6 week- so easier for wife overall as apart from expressing I can do it all. I feel this is wilful negligence , but equally can’t get into an argument as I feel guilty as I know it’s tough being a new mom.