Quick answer: Week 16: What anatomy scan checks, gender reveal, preparing questions, soft markers.
Week 16 puts you in the second trimester — often called the golden period of pregnancy, and for good reason. Energy typically improves, nausea subsides, and the pregnancy becomes physically and emotionally more comfortable for most women.
Baby Development This Week
At week 16, your baby is approximately the size of a avocado — measuring around 4.6 in / 11.6cm. Facial muscles are working. Baby is beginning to hear muffled sounds. All organs are now formed and the focus has shifted entirely to growth and maturation. Your baby is increasingly responsive to sound, light, and touch.
Symptoms You May Feel
Common week 16 second trimester symptoms include: round ligament pain (sharp, brief twinges on the sides of your abdomen as the uterus grows rapidly), Braxton Hicks contractions (occasional irregular tightening — harmless practice contractions), back pain as your center of gravity shifts forward, nasal congestion from increased blood volume, skin changes including the linea nigra (dark line down the abdomen) and possible chloasma (facial darkening), and for many women, a welcome increase in energy and libido compared to the first trimester.
What anatomy scan checks, gender reveal, preparing questions, soft markers
The anatomy scan at 18–22 weeks is a detailed ultrasound evaluating over 20 anatomical structures: brain, spine, heart (four chambers and outflow tracts), kidneys, bladder, stomach, abdominal wall, limbs, and face. ‘Soft markers’ are minor variations that slightly increase the statistical probability of chromosomal differences — isolated choroid plexus cysts, echogenic foci in the heart, renal pelvis dilation. Isolated soft markers in low-risk pregnancies carry minimal clinical significance; their significance is context-dependent. Placenta position is checked — approximately 1% of placentas that appear low-lying at 20 weeks will be confirmed as previa at 32+ weeks. Gender is reliably determined at the anatomy scan if desired.
When should I feel the baby move at week 16?
Week 16 is the earliest that most women reliably begin feeling movement, and it’s still early for many first-time mothers. The sensation is typically described as light tapping, fluttering, or ‘bubbles.’ It’s intermittent and easy to miss at first. A consistent, recognizable pattern of movement typically establishes around weeks 24–28 — formal kick counting isn’t recommended until then. If you’ve had no movement by 22–24 weeks as a first-time mother, mention it at your next appointment.
Practical Tips for Week 16
- Start pelvic floor exercises (Kegels) now — 3 sets of 10-second holds, 3 times daily pays dividends postpartum.
- Consider a pregnancy pillow as your bump grows — better sleep protects energy and mood.
- Book prenatal/childbirth classes early — good ones fill up months in advance.
- Continue prenatal vitamins and increase iron-rich foods as blood volume expands significantly.
- Walk 30 minutes daily — the evidence for maternal and fetal benefits is consistent and strong.
- Begin researching your birth plan options and discussing preferences with your provider.
When to Call Your Midwife or OB
Contact your provider for: regular contractions before 37 weeks (more than 4 per hour), decreased fetal movement, severe headache with visual changes, sudden swelling of the face or hands, any bleeding, or fever above 101°F / 38.3°C. Trust your instincts — if something feels different or wrong, call.
Frequently Asked Questions
When should I feel the baby move at week 16?
First movements (quickening) are typically felt between weeks 16–25. First-time mothers usually notice them later than those who’ve been pregnant before. Early movements feel like flutters, bubbles, or light taps — easily confused with gas. They become unmistakable kicks and rolls as the weeks progress. If you have an anterior placenta (at the front of the uterus), it cushions movement and you may feel it later than expected.
Is lower back pain normal in the second trimester?
Very much so — it affects around 50% of pregnant women. Your growing uterus shifts your center of gravity forward, your ligaments loosen from relaxin, and your posture compensates in ways that strain the lumbar spine. Prenatal yoga, swimming, a maternity support belt, and sleeping with a pillow between your knees all provide significant relief. If pain is severe, radiates down the leg, or is accompanied by numbness or tingling, mention it to your provider.
When should I start buying baby gear?
Week 16 is a reasonable time to start researching — particularly big-ticket items like strollers, car seats, and cribs that may need to be ordered months in advance. Most parents wait until after the 20-week anatomy scan (when risk drops significantly) before major purchases. Baby showers are typically held in the third trimester, so let that guide the timing of purchases you expect as gifts.
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Related Reading
- 15 weeks pregnant: bump starting to show
- 17 weeks pregnant: your baby can hear you now
- Pregnancy symptoms week by week: what’s normal when
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