17 weeks pregnant
Second trimester about 3 months
At 17 weeks pregnant, your baby is about the size of a pear.
Baby this week
About 130mm. Fat is beginning to accumulate under the skin, which will help regulate body temperature after birth. The umbilical cord is growing thicker and stronger.
Did you know? The fetus is now building a layer of brown fat that will be essential for heat regulation after birth — newborns can't shiver to warm up, so this fat does the work.
What she may be feeling
- Visible bump
- Baby movements becoming more regular
- Back pain
- Round ligament pain
- Heartburn
- Varicose veins possibly appearing
- Stretch marks may begin
- Increased energy
Tips for her this week
- You may be feeling the best you've felt all pregnancy — second trimester energy is real.
- Baby's movements may be becoming more noticeable — enjoy feeling them.
- Your center of gravity is shifting — be careful with balance and avoid risky activities.
- Start thinking about a birth plan in concrete terms: pain management preferences, who's in the room, etc.
For partners
- This is often the sweet spot of pregnancy — she has energy, the bump is showing, and anxiety has eased.
- Plan something romantic or memorable — a babymoon, a special dinner, a getaway.
- The nursery should be taking shape by now — make it a shared project.
- Start thinking about the hospital bag — it's not too early to begin a list.
Partner to-do list
- Plan a babymoon or special trip — the window is closing
- Work on the nursery together
- Start the hospital bag list
- Read about labor coaching and your role in the birth room
This week together
- Book babymoon if planned
- Write a draft birth plan
- Start the hospital bag list
- Discuss pain management preferences for labor
When to call your doctor or midwife
Contact your care provider right away, or call emergency services, if she has:
- Heavy bleeding
- Severe pain
- Fever
- Regular contractions or pressure
Trusted guidance: NHS: Pregnancy · NHS: Pregnancy complications · ACOG: Pregnancy · Pregnancy Info: Your pregnancy
Common questions
How big is the baby at 17 weeks?
At 17 weeks pregnant, your baby is about the size of a pear. About 130mm.
How many months is 17 weeks pregnant?
17 weeks pregnant is about 3 months, in the second trimester.
What can partners do at 17 weeks?
This is often the sweet spot of pregnancy — she has energy, the bump is showing, and anxiety has eased. Plan something romantic or memorable — a babymoon, a special dinner, a getaway.