Better blood flow to the uterus for the baby. My doc told me if I happen to find myself sleeping on my back, it's no big deal. Your body will alert you when something is wrong and you will turn to your sides anyway. Don't worry about that too much. Can you imagine our mothers and grandmothers, they didn't have all these pregnancy rules and we all turn out to be fine!
take advantage of sleeping on your back while you can! Trust me I am 32 weeks with twins and I am miserable at night. I long for the days when i could sleep. I just cant stay comfortable! When you start feeling dizzy or lightheaded while laying on your back that is a good indicator that you are ready for your side!!
I was encouraged to start sleeping on my left side as early in the pregnancy as I could...it's very uncomfortable at first, but your body will adjust and it's a lot easier to make that change earlier on then trying to do it when your belly starts getting bigger.
Any position which limits your blood flow should be avoided all together....if you can't breath comfortably then neither can baby...I slept on my stomache til aprox 20-22 wks then I couldn't anymore..I think would feel baby kicking me..tell me to get my butt off of him I'm squishing him...and I don't do it anymore..any time I do he kicks so that is a sign....I sleep on my side b/c being on my back for too long will make me waddle like a duck when I get up....stresses out the vena cava and its not good....a big fluffy pillow between the legs is very comfy
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