Could it be the general high temperatures and crazy humidity of late? I sleep in an air conditioned room and I wear t shirt + shorts yet I still get the sticky sweaty feeling on my neck. If an adult go through such discomfort, imagine how it'll be for a little baby. I reckon as long she gets through the night without crying and sleep just fine, it should be fine.
Think it is just that the ventilation is not as good. The "exposed" areas sounds alright. Perhaps can try changing the sheets or her bodysuit to a material that is lighter/airier? If baby is comfortable enough to sleep through the night, I wouldn't be too worried. :)
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