You shouldn't lie on your back during 2nd and 3rd trimester because the weight of your uterus is too much for your inferior vena cava, which is a major blood vessel. You will slow blood flow for both yourself and baby which is why it's not such a great idea to spend a long time on your back.


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I tell my husband to roll me over if he finds me on my back
and he has been good by doing this. It's a hard habit to break when it's a position you are used to sleeping in.

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