Welcome to the second trimester! This week, your baby is developing two traits that make them uniquely human: vocal cords are forming in the larynx, and distinct, swirling patterns of ridges are appearing on the tips of their tiny fingers — their permanent fingerprints.
🍼 What's Happening With Your Baby
Now the size of a lemon, the fetus is growing more rapidly than ever. The head, which was previously enormous compared to the body, is now about one-third of the total length as the torso catches up.
The bones in the arms and legs are hardening, and the joints are fully articulated. The baby can bend its arms at the elbows and flex its wrists.
The intestines are maturing, and the first bowel movement, called meconium, is beginning to form in the digestive tract. It will stay there until after birth.
🤰 What You're Feeling This Week
You've officially entered the 'honeymoon phase' of pregnancy. For most women, the nausea and crushing fatigue of the first trimester have dissipated, replaced by a surge in energy and a renewed appetite.
As your uterus grows upward and out of the pelvis, you may notice the pressure on your bladder decreasing, meaning fewer frantic trips to the bathroom.
However, this upward growth means the uterus is now pressing against the abdominal wall. You might finally notice a distinct, hard little bump forming just above your pubic bone.
Unique Fingerprints Form
The ridges on the fingertips are fully formed. These unique patterns are influenced by genetics and the random movements of the fetus in the amniotic fluid. No two fingerprints are alike, not even in identical twins.
✅ What To Do This Week
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Review your exercise routine — With your energy returning, now is a great time to resume moderate exercise like swimming, prenatal yoga, or brisk walking. Avoid contact sports or activities with a high fall risk.
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Start moisturizing your belly — As your skin stretches to accommodate the growing uterus, it can become itchy. While lotions can't entirely prevent stretch marks (which are largely genetic), keeping the skin hydrated relieves discomfort.
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Stop sleeping flat on your back — As the uterus grows heavier, sleeping on your back can compress the inferior vena cava, a major vein, reducing blood flow to the baby and making you dizzy. Start practicing side-sleeping.
"The nausea has broken like a fever. You are stepping into the light of the second trimester. Your body is no longer in chaotic construction mode; it is in steady, powerful expansion mode."
— A Note From Your Body, Week 13