When you lie supine, that is, lying face down on your back, pressure from the uterus can be exerted on surrounding muscles, ligaments and structures, including the fetus. This can cause the fetus to kick more.
There are several theories about fetal kicks when you lie on your back:
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Inhalation: When you lie on your back, the space in your uterus may be limited. This can make the fetus feel short of breath or uncomfortable, and therefore, the fetus may respond.
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Pressure from the uterus: When you lie on your back, pressure from the uterus can be transferred to surrounding muscles and structures, stimulating the fetus. This may cause the fetus to respond or move more.
However, each pregnancy and fetus is unique, and fetal activity levels can vary from person to person. It is important to monitor your baby’s movements and discuss with your doctor or health care provider if you have any concerns or questions about your baby’s activity in your womb.