Pregnancy week 17
This week your baby is about the size of a pear — around 13 cm and 140 g.
Your baby this week
This week your baby begins building brown fat, a special tissue that will help regulate body temperature after birth. The cartilage that formed the skeleton is slowly hardening into bone, and movements are becoming more coordinated. The umbilical cord is growing stronger and thicker to carry nutrients and oxygen efficiently. Your little one may also be starting to pick up sounds from the world around them.
Your body this week
You may notice some aches in your lower back or pelvis as your uterus grows and your center of gravity shifts. It's also common to feel hungrier and more energetic than during the first months. Hormonal changes may bring skin changes, such as darkening of certain areas.
Tips for this week
Choose comfortable, low-heeled shoes to support your balance and ease pressure on your back. Try sleeping on your side with a pillow between your knees for extra comfort. And remember that every pregnancy is different, so never hesitate to check in with your doctor or midwife about any concern.
Frequently asked questions
How big is the baby at week 17?+
At week 17, your baby is about the size of a pear — roughly 13 cm and 140 g, though every baby grows at its own pace.
Which trimester is week 17?+
Week 17 falls in the Second trimester.
How many weeks are left at week 17?+
At week 17, you have about 23 weeks to go until the typical 40-week due date.
Is week 17 normal?+
Every pregnancy is different. If you feel well and your check-ups are on track, week 17 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.