I woeked night shift with my first so he slept in the womb and was awake during the day as I slept. when I had him he slept in the night and was up during the day. it was the opposit when I had my other 2. and they slept as babies through the day and up through the night.
Babys sleep all day because your movements rock them to sleep in the womb, hence the reason they like swings and rockers to put them to sleep. Kt reminds them of the womb. They wake up usually in the night because you are still.
My son slept all day in the womb and was up while I slept I barely felt him during the day because of it. And when he was born it was basically the same but it didn't matter it just meant I slept all day with him.
I have heard they have similar sleeping patterns once they are born but things like feeding and people being around will affect their sleeping