Pregnancy week by week / Week 16
16 weeks pregnant
That’s 4 months — the second trimester, with 24 weeks to go.
Baby size at 16 weeks
Your baby is about 11.6 cm (4.6 in) long and weighs about 0.10 kg (4 oz) — roughly the size of an avocado.
What’s happening at 16 weeks
Tiny movements may soon be felt as "quickening". The eyes and ears are nearly in their final position and the baby can hear muffled sounds.
Common symptoms at 16 weeks pregnant
- •First flutters (quickening)
- •Backache
- •Constipation
- •"Baby brain" forgetfulness
- •Bigger appetite
Every pregnancy is different — you may have all, some or none of these. Contact your doctor or midwife about anything that concerns you.
Count down to your due date
If you’re 16 weeks pregnant today, your due date is around Tuesday, December 1, 2026. Adjust the date below and create a free countdown to share.
First day of your last menstrual period (how doctors date a pregnancy)
⚕️ This is an estimate based on Naegele’s rule (40 weeks from your last period). Only about 1 in 20 babies arrive on the exact due date. Always confirm with your doctor or midwife.
FAQ
How many months is 16 weeks pregnant?
16 weeks pregnant is about 4 months, in the second trimester.
How big is the baby at 16 weeks?
At 16 weeks the baby is about 11.6 cm (4.6 in) long and weighs about 0.10 kg (4 oz) — roughly the size of an avocado.
What are the symptoms at 16 weeks pregnant?
Common symptoms around 16 weeks include first flutters (quickening), backache, constipation, "baby brain" forgetfulness. Symptoms vary a lot from person to person — contact your provider if anything worries you.
When is my due date if I am 16 weeks pregnant?
If you are exactly 16 weeks pregnant today, your estimated due date is around Tuesday, December 1, 2026 — 24 weeks from now. Use the calculator below with your real last-period date for a personalised estimate.
See every stage on the pregnancy week-by-week guide or open the full due date calculator.