Quick answer: Week 17: Auditory development, talking to bump, music benefits, round ligament pain.
Week 17 puts you in the second trimester — often called the golden period of pregnancy, and for good reason. Energy typically improves, nausea subsides, and the pregnancy becomes physically and emotionally more comfortable for most women.
Baby Development This Week
At week 17, your baby is approximately the size of a turnip — measuring around 5.1 in / 13cm. Hearing is developing rapidly — baby can detect sounds from outside the womb. All organs are now formed and the focus has shifted entirely to growth and maturation. Your baby is increasingly responsive to sound, light, and touch.
Symptoms You May Feel
Common week 17 second trimester symptoms include: round ligament pain (sharp, brief twinges on the sides of your abdomen as the uterus grows rapidly), Braxton Hicks contractions (occasional irregular tightening — harmless practice contractions), back pain as your center of gravity shifts forward, nasal congestion from increased blood volume, skin changes including the linea nigra (dark line down the abdomen) and possible chloasma (facial darkening), and for many women, a welcome increase in energy and libido compared to the first trimester.
Auditory development, talking to bump, music benefits, round ligament pain
Fetal hearing is functional by approximately 16–18 weeks — external sounds are transmitted through the amniotic fluid and uterine wall. The evidence for talking, reading, and playing music to your bump: newborns show preferential response to voices heard regularly in utero, suggesting some prenatal auditory learning does occur. Round ligament pain — sharp, brief twinges on the sides of the abdomen — is common from week 14 onward and peaks around weeks 17–20 as the uterus grows most rapidly. It’s caused by stretching of the ligaments that support the uterus and is harmless, though startling. Stretching and positional changes ease it; it does not require treatment.
When should I feel the baby move at week 17?
Week 17 is when many first-time mothers begin noticing occasional movement — still light, intermittent, and not yet consistent. The fetus at 17 weeks weighs approximately 140g and can hear sounds outside the womb; research shows newborns recognize voices and music heard regularly in utero. This week is also when some women first notice round ligament pain — sharp, brief twinges in the lower abdomen from the uterine ligaments stretching. It’s uncomfortable but harmless.
Practical Tips for Week 17
- Start pelvic floor exercises (Kegels) now — 3 sets of 10-second holds, 3 times daily pays dividends postpartum.
- Consider a pregnancy pillow as your bump grows — better sleep protects energy and mood.
- Book prenatal/childbirth classes early — good ones fill up months in advance.
- Continue prenatal vitamins and increase iron-rich foods as blood volume expands significantly.
- Walk 30 minutes daily — the evidence for maternal and fetal benefits is consistent and strong.
- Begin researching your birth plan options and discussing preferences with your provider.
When to Call Your Midwife or OB
Contact your provider for: regular contractions before 37 weeks (more than 4 per hour), decreased fetal movement, severe headache with visual changes, sudden swelling of the face or hands, any bleeding, or fever above 101°F / 38.3°C. Trust your instincts — if something feels different or wrong, call.
Frequently Asked Questions
When should I feel the baby move at week 17?
First movements (quickening) are typically felt between weeks 16–25. First-time mothers usually notice them later than those who’ve been pregnant before. Early movements feel like flutters, bubbles, or light taps — easily confused with gas. They become unmistakable kicks and rolls as the weeks progress. If you have an anterior placenta (at the front of the uterus), it cushions movement and you may feel it later than expected.
Is lower back pain normal in the second trimester?
Very much so — it affects around 50% of pregnant women. Your growing uterus shifts your center of gravity forward, your ligaments loosen from relaxin, and your posture compensates in ways that strain the lumbar spine. Prenatal yoga, swimming, a maternity support belt, and sleeping with a pillow between your knees all provide significant relief. If pain is severe, radiates down the leg, or is accompanied by numbness or tingling, mention it to your provider.
When should I start buying baby gear?
Week 17 is a reasonable time to start researching — particularly big-ticket items like strollers, car seats, and cribs that may need to be ordered months in advance. Most parents wait until after the 20-week anatomy scan (when risk drops significantly) before major purchases. Baby showers are typically held in the third trimester, so let that guide the timing of purchases you expect as gifts.
Disclosure: This post contains affiliate links. We may earn a small commission at no extra cost to you. We only recommend products we genuinely trust.
Related Reading
- 16 weeks pregnant: anatomy scan coming up
- 18 weeks pregnant: feeling the first kicks
- Nobody told me postpartum would feel like this
Found this helpful? Sign up to the LylyMama newsletter for evidence-based guides, honest essays and practical advice delivered to your inbox every week.
