15 weeks pregnant
Second trimester about 3 months
At 15 weeks pregnant, your baby is about the size of an apple.
Baby this week
About 100mm. The fetus is forming taste buds and can sense light. The skeleton continues hardening and joints are becoming more flexible.
Did you know? Babies can taste amniotic fluid from around week 15, and studies show they respond to flavors from their mother's diet — flavors they'll recognize after birth.
What she may be feeling
- Quickening (first movements) starting for some
- Growing belly
- Round ligament pain
- Back pain
- Heartburn
- Nasal congestion
- Increased appetite
- Leg cramps at night
Tips for her this week
- You may start feeling quickening — first baby movements — around now or in the next few weeks.
- Back pain can increase as your center of gravity shifts. Stretching and prenatal yoga help.
- Continue to sleep on your side (left is slightly preferred) to optimize blood flow.
- Schedule any dental work now — the second trimester is the safest window for dental procedures.
For partners
- You may be able to hear the heartbeat at home with a Doppler device — many couples enjoy this.
- Talk to her belly — research suggests babies begin responding to familiar voices in the womb.
- Keep up with the nursery planning — paint, furniture, and decor take time.
- Start thinking about your birth support role — what do you want to do during labor?
Partner to-do list
- Talk to her belly — your baby can hear familiar voices
- Research your birth support role and what labor coaching involves
- Schedule any dental work for her in the next few weeks
- Start buying nursery items: furniture has long lead times
This week together
- Decide on nursery theme and begin purchasing
- Schedule a prenatal dental appointment
- Discuss your birth support team — doula, family, just you?
- Research pediatricians — you'll want one lined up before birth
When to call your doctor or midwife
Contact your care provider right away, or call emergency services, if she has:
- Heavy bleeding
- Severe abdominal pain
- Fever
- Signs of preterm labor: regular contractions, pressure, watery discharge
Trusted guidance: NHS: Pregnancy · NHS: Pregnancy complications · ACOG: Pregnancy · Pregnancy Info: Your pregnancy
Common questions
How big is the baby at 15 weeks?
At 15 weeks pregnant, your baby is about the size of an apple. About 100mm.
How many months is 15 weeks pregnant?
15 weeks pregnant is about 3 months, in the second trimester.
What can partners do at 15 weeks?
You may be able to hear the heartbeat at home with a Doppler device — many couples enjoy this. Talk to her belly — research suggests babies begin responding to familiar voices in the womb.