Week 16: First Movements
Week sixteen is the time when you can feel your baby's first movements!
Baby size: Avocado (50-55 mm)
Baby development
Little gymnast with a strong spine
Your baby holds his head and back increasingly straight. His nervous system is maturing, allowing him to coordinate his movements — he can grasp the umbilical cord, wave his arms and legs.
What’s happening this week:
- Eyes and ears: The eyes can already move, and the tiny bones in the ears and nerve endings in the brain have developed enough that he can hear your voice!
- Hair: Hair begins to grow on the head, along with eyelashes and eyebrows.
- Heart: His heart works very actively, pumping about 24 liters of blood per day.
- Muscles: Facial muscles continue to develop, allowing him to practice even more varied expressions.
Start talking, singing, and reading aloud to your baby. He already hears you, and the sound of your voice soothes him.
Changes for mom
Belly expands, and the back reminds you
Your belly has noticeably rounded as the uterus continues to grow actively. This can lead to some new sensations, including back pain.
What you may notice:
- Lower-back pain: Gaining weight and shifting the center of gravity place extra strain on the back.
- "Pregnancy glow": Your skin may look especially fresh and healthy thanks to the increased blood volume.
- Increased appetite: You may feel a strong hunger. It’s important to choose nutritious snacks to fuel yourself and the baby.
- Steady weight gain: You are beginning to gain weight steadily, about 0.5 kg per week.
Proper weight gain is important for a healthy pregnancy. Learn more about the guidelines and recommendations in the article "Weight Gain During Pregnancy".
Overview
Week 16: Rapid Growth and First Flutters
At sixteen weeks, your baby experiences a significant growth spurt. Over the next few weeks, he will double his weight and grow considerably in length.
He is now the size of an avocado. His skeletal system and muscles are becoming stronger, making his movements more vigorous. If this is your second or subsequent pregnancy, you are likely already feeling these gentle flutters.
This week, your belly becomes noticeable to everyone. You may feel full of energy and enjoy your "pregnancy glow," which appears thanks to increased blood circulation.
This is a period of active growth. Every gram your baby gains and every centimeter he grows is an important investment in his healthy future.
You are in the middle of the most comfortable stage of pregnancy. To learn more about what lies ahead, check out our detailed guide to the second trimester.
Tips for mom
Caring for your back and preparing for screening
Right now your main priorities are the comfort of your back and preparation for important medical examinations.
What to do:
- Watch your posture. Try not to hunch or arch your lower back excessively. Sleep on a comfortable mattress.
- Wear comfortable shoes. Swap high heels for stable, low‑heel footwear.
- Discuss the second screening with your doctor. Ask about the “triple” or “quadruple” test (blood analysis for genetic anomalies), usually performed between weeks 15 and 20.
- Start thinking about childcare. If you plan to return to work, now is a good time to explore options (nanny, daycare).
To be ready for all medical procedures, review our article on screenings during pregnancy.
Tips for partner
Master of massage and emotional support
Your involvement now can be very practical and pleasant for your partner.
Your contribution to shared comfort:
- Offer a back massage. A gentle relaxing lower‑back massage can work wonders after a long day.
- Talk to the belly. Your voice is one of the first sounds the baby distinguishes. It’s a great way to build a connection before birth.
- Take part in big decisions. Discuss important topics together, such as choosing a pediatrician or parenting approaches.
- Be patient and attentive. Even in the “golden” trimester, she may have days of low mood or discomfort.
Finding “the right” doctor for the child is an important step. You can find useful advice in our article "How to Find Your Pediatrician: Selection Criteria".
Checklist
Your action plan for week 16
We continue the active and positive second trimester.
- ✅ Discuss with your doctor and schedule the second blood screening.
- 🗣️ Start talking or reading to the belly daily.
- 💆♂️ Arrange a massage evening to relieve back tension.
- 🍼 Begin learning about breastfeeding.
- 👶 Actively discuss baby names and compile a list of favorites.
- 📚 Learn more about newborn care, for example by reading the article on the first bath.