Fetal Development at Week 37

The fetus is full term at week 37 says the Mayo Clinic and can be born safely at any time from that point on. Many of the fetal developments during this stage are a preparation for life outside of the uterus.

  1. Weight

    • According to WhatToExpect.com, an average fetus weighs about 6.5 lbs. at 37 weeks and will continue gaining about 1 1/2 lbs. a week until delivery. From head to heel, the length of the fetus is approximately 19 inches.

    Fingers and Thumbs

    • At 37 weeks, the fetus prepares for suckling at the breast by frequently sucking on his thumb. The fingers are now able to grasp, as coordination has now developed, according to the Children's Hospital.

    Respiration

    • Lungs are now mature and at 37 weeks, the fetus is inhaling and exhaling amniotic fluid, mimicking breathing, to prepare the lungs for life outside of the uterus.

    Movement

    • The fetal eyes are blinking frequently and the head may turn towards a source of light outside the uterus. The fetus remains active but has less room to move at 37 weeks, so movements may be more of a rolling action from side to side.

    Lanugo and Vernix

    • Most of the lanugo, the downy hair that covers the body and the vernix, a substance that covers and protects the skin of the fetus is absorbed into the amniotic fluid by 37 weeks.

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