Pregnancy week 18
This week your baby is about the size of a bell pepper — around 14.2 cm and 190 g.
Your baby this week
Your baby is more active this week, yawning, stretching, and moving hands and feet freely inside the womb. Unique fingerprints are forming, and a protective coating called myelin is beginning to develop around the nerves to help signals travel faster. If you're expecting a girl, her uterus and fallopian tubes are settling into place; if a boy, his genitals are becoming more defined. The ears are also moving into their final position on the sides of the head.
Your body this week
You may soon feel your baby's first gentle kicks, often like a light flutter in your belly. It's also common to feel dizzy at times as your circulation changes, so rise slowly from sitting or lying down. You might notice mild swelling in your feet toward the end of the day.
Tips for this week
This week may include your detailed anatomy ultrasound, a lovely chance to see your baby, so enjoy it. Drink plenty of water throughout the day to stay energized and reduce swelling. If dizziness happens often or feels severe, let your healthcare provider know.
Frequently asked questions
How big is the baby at week 18?+
At week 18, your baby is about the size of a bell pepper — roughly 14.2 cm and 190 g, though every baby grows at its own pace.
Which trimester is week 18?+
Week 18 falls in the Second trimester.
How many weeks are left at week 18?+
At week 18, you have about 22 weeks to go until the typical 40-week due date.
Is week 18 normal?+
Every pregnancy is different. If you feel well and your check-ups are on track, week 18 is usually a normal part of the journey — but always reach out to your doctor or midwife with any concern.
This guide is for general information and reassurance — it isn't medical advice. Always follow your doctor or midwife for your own pregnancy.