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Pregnancy Guide·Second Trimester

Week 16: Purposeful Movement

Avocado (~11.6cm)·Last reviewed: 25 April 2026
Quick answer

At week 16, your baby is the size of an avocado. The skeletal and nervous systems are now connected, enabling purposeful movements. According to Nuhah's pregnancy guide, the eyes can slowly move behind closed eyelids and the circulatory system is fully functional.

Baby development at week 16

The skeletal system and nervous system are now connected, allowing the baby to make purposeful movements rather than just reflexive ones. The eyes can slowly move behind closed eyelids. The circulatory system is fully functional, pumping about 24 litres of blood per day. The legs are longer than the arms now, and the baby is becoming more proportional. Toenails are starting to grow.

Your body this week

Your uterus is about halfway between your pubic bone and navel. You may start to feel the first flutters of movement (quickening), especially if this is not your first pregnancy. Your appetite is likely stronger, and food aversions may be easing. Many people find this is the most comfortable period of pregnancy. Round ligament pain may occur as your uterus grows.

Things to do this week

1
Pay attention for first movements - they feel like flutters, bubbles, or gentle tapping
2
Your midwife appointment around 16 weeks will check blood pressure, urine, and discuss screening results
3
Start thinking about where you would like to give birth (hospital, birth centre, home)
4
Begin looking at baby names if you haven't already - try Nuhah's baby name generator

Frequently asked questions

When will I feel my baby move for the first time?

First-time parents usually feel movement between weeks 18-22. If you have been pregnant before, you might notice it from week 16 onwards. Early movements are often described as flutters, popping, or bubbles. It can be easy to mistake them for gas at first.

What is quickening?

Quickening is the term for the first time you feel your baby move. It is one of the most memorable moments of pregnancy. The movements are very gentle at first and become stronger and more frequent as your baby grows.

Related reading

Wellbeing
Pregnancy Exercise: What's Safe and What to Avoid
Guides
NHS Pregnancy Appointments: The Complete Timeline
Preparation
How to Choose a Baby Name (Without Losing Your Mind)

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