Some people think that wearing diapers does lead to more bed wetting. The reason I've heard them say this is because they think it makes the child lazy and tells them it's okay to continue to wet the bed.
I disagree with this statement. Bed wetting is something a child cannot control so whether they wear the diaper or not the child will still wet the bed.
If the child is willing to wear a diaper to bed then you should let your child wear the diaper for bed wetting as it will make them more comfortable instead of waking up in a wet cold bed and clothes.
The diaper will not make bed wetting worse since bed wetting occurs due to the bladder not growing at the same rate of the child.