16 Weeks Pregnant: What to Expect This Week
Sixteen weeks pregnant and your baby has reached avocado size — and the most magical milestone of pregnancy may be just days away: first movements. Many first-time parents feel those unmistakable flutters between weeks 16 and 22.
Baby at Week 16: Size of a avocado
Baby's Development at 16 Weeks
The nervous system is developed enough that the baby can hear your voice and will recognise it after birth. Baby is stretching, rolling, and constantly moving — the amniotic fluid provides a weightless playground. The eyes are beginning to move, and while the eyelids remain fused, the irises are fully formed. The circulatory system is fully functional, and blood is pumping through all the arteries and veins. Toenails are growing.
Your Body at 16 Weeks Pregnant
The quintessential second-trimester symptom, quickening (first fetal movements), often appears between weeks 16 and 20 for first-time parents, and earlier for those who've been pregnant before. It feels like bubbles, flutters, or butterflies — delicate and easy to miss at first. Backache becomes common as the growing uterus shifts your centre of gravity. Swelling in the hands and feet may begin.
Tips for Week 16
- Track when you first feel movement — a great memory to record in a pregnancy journal.
- Back pain: a pregnancy support belt, good posture, and prenatal yoga can all make a difference.
- The 16-week antenatal appointment typically includes blood pressure check, urine test, and discussion of the anatomy scan.
- Invest in good, supportive footwear now — your feet will thank you.
Try it free →
Frequently Asked Questions
What do fetal movements feel like at 16 weeks?
At 16 weeks, if you can feel movement at all, it typically feels like gentle bubbles, flutters, or a light tapping sensation — sometimes described as a fish swimming or butterfly wings. It's easy to confuse with gas early on. As weeks pass, the movements become more distinct and stronger.
How much weight should I have gained by 16 weeks?
Average weight gain guidelines suggest 1–2 kg (2–4 lbs) in the first trimester, then about 0.5 kg (1 lb) per week in the second trimester. At 16 weeks, total gain of around 2–4 kg is typical for a single pregnancy. Your provider will monitor this alongside your overall health — individual variation is significant.
Log your first movements
Hello, baby makes it easy to capture the milestones that matter most — including the very first time your baby moves.
Start for free →