Baby developing inside you
over the weeks and months
Weeks, Months and Trimesters Guides
Week Thirteen: Baby flexes and kicks
|You are 13 weeks pregnant. (fetal age 11 weeks)|
BabyYour baby is now producing insulin the hormone that controls their blood glucose. The fetus is now 3 inches long and weighs about an ounce. The baby's unique fingerprints are already in place. The muscles lengthen and become organized. You can't feel it yet, but your baby can move in a jerky fashion, flexing the arms and kicking the legs.
MotherYour uterus has grown quite a bit. You can probably feel its upper edge above the pubic bone in the lowest part of your abdomen, about 4 inches (10cm) below your bellybutton. At 13 weeks, your uterus fills your pelvis and starts growing upward into your abdomen. It feels like a soft, smooth ball. Soon you will start feeling the first flutters of the unborn child kicking and moving within.
The first three months were period of rapid development, next three months will be period of rapid growth. Baby quadruples weight during the 4th month. Your baby is now about 2.91 inches (7.4cm) and weighs around 0.81 ounce (23gm).
Week by week: First trimester ultrasound scan pictures: Week 13
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