34+ Normal Fetal Heart Rate At 7 Weeks Background. Take a peek at this fetal heart rate chart to get an idea of how it changes week to week A normal foetal heart rate is between 120 and 160 beats per minute (bpm).
Fetal ultrasound measurements can show how the baby is growing and detect abnormalities.
However, if your doctor notices that your baby's heart beat is off by a week or more it can indicate that a miscarriage. Even though at 4 weeks pregnant that sweet, sweet heartbeat hasn't yet arrived, a distinct blood vessel has formed inside your embryo, which will soon develop into your baby's heart and circulatory (blood) system. It is considered slow for this age only if it is below 120 per minute. Harris birthright research centre for fetal medicine and early pregnancy unit, king's college hospital, london, uk.