Pregnancy Week 22: Baby Hears You, Moves with a Pattern

Your baby is listening right now Week 22 — past the 500 g mark, hearing developed, movements taking on a rhythm

Week 22 sits in the middle of the second trimester. Your baby is growing fast: hearing is now developed enough to register sounds from outside the womb, and fetal movements are becoming regular enough that you can start to notice when your baby tends to be awake.

Per NHS guidance [1] and ACOG [2], this is the closing end of the 18–22 week window for the anatomy scan (mid-pregnancy ultrasound). If yours hasn't been scheduled yet, call your OB today.

Your baby at week 22

Per NHS [1], your baby is about 27.8 cm crown-to-heel and weighs roughly 430–500 grams — close to the size of a large sweet potato or a small ear of corn.

Key developments this week:

• Lungs — actively developing; your baby is practising breathing movements in the amniotic fluid. The lungs can't breathe air yet, but the muscles are getting stronger [1].
• Hearing — the auditory system is well developed. Your baby can hear voices, music, and ambient sounds through the uterine wall. Your voice is the most familiar sound [3].
• Taste buds — beginning to function. Your baby swallows amniotic fluid and may detect the flavours of what you eat [1].
• Vernix caseosa — a creamy white coating covering the skin, protecting it from amniotic fluid for the remaining weeks of pregnancy.
• Lanugo — fine downy hair still covers most of the body, helping hold the vernix in place.
• Movement — increasingly distinct and patterned. You may start to notice when your baby tends to be active versus quiet.

Your body at week 22

Your uterus sits about 2–3 finger-widths above the navel. The bump is now clearly visible, skin is stretching, and second-trimester symptoms are in full swing.

Common symptoms at 22 weeks, per NHS [1]:

• Round ligament pain — sharp or dull aching on one or both sides of the lower abdomen, caused by ligaments stretching as the uterus grows. Can flare when you stand up quickly or cough — this is normal.
• Leg cramps — especially at night. Stay well hydrated and stretch your calves before bed.
• Nasal congestion — swollen nasal membranes from pregnancy hormones; easy nosebleeds are common.
• Haemorrhoids (piles) — the growing uterus puts pressure on veins near the rectum. High-fibre diet and fluids help.
• Vivid or strange dreams — reduced deep sleep and hormone changes make dreams more intense.
• Other — constipation, heartburn, backache, breast tenderness, leg swelling.

Anatomy scan follow-up

If your anatomy scan at week 20 flagged anything for follow-up — soft markers, a finding that needs re-imaging, or a referral — this week may be when that appointment falls.

Actions:

• If you haven't had your anatomy scan yet, book it now. The 18–22 week window closes soon [2].
• If the scan found an unexpected finding, ask for a referral to a Maternal-Fetal Medicine (MFM) specialist for evaluation and planning.

The periviable window: what to know

In obstetrics, the periviable period refers roughly to 20 to 25+6 weeks of gestation [3] — the window where survival outside the womb becomes medically possible with intensive NICU support. Outcomes (survival and long-term development) depend strongly on gestational age at birth — every additional week in the womb materially improves the odds.

For a normal, uncomplicated pregnancy this is background medical context, not a cause for anxiety. It is, however, the reason why warning signs (vaginal bleeding, fluid leak, rhythmic cramping) need prompt evaluation at any point in the second trimester rather than waiting for your next appointment.

Every day a baby remains in the womb means more lung and brain development.

Self-care this week

Per WHO antenatal care recommendations [4] and ACOG [2]:

Nutrition

• Iron — 27 mg/day to prevent anemia, which becomes more common in the second trimester
• Calcium — 1,000 mg/day to support your baby's bone development
• Omega-3 (DHA) — 200–300 mg/day for brain and eye development
• Fibre — helps with constipation and haemorrhoids

Activity

• Aim for 150 minutes of moderate activity per week (walking, swimming, prenatal yoga) [4]
• Sleep on your left side after week 20 to avoid compressing the major blood vessels behind the uterus
• Avoid contact sports, fall-prone activities, saunas, and hot tubs

Mental health

Vivid dreams, birth anxiety, and mood shifts are normal at this stage. Talk to your partner or a trusted person. If you feel persistently low or anxious, mention it at your next prenatal appointment.

When to call your OB

• Vaginal bleeding at any volume
• Severe or persistent abdominal pain, or rhythmic cramping (possible preterm labour)
• Fluid leaking from the vagina
• Fetal movement feels noticeably less than your usual pattern — contact your provider
• Swelling of the face, hands, severe headache, or blurred vision — possible pre-eclampsia signs [5]
• Fever > 38.5°C (101.3°F)

Summary

Week 22 is a milestone for connection — your baby can hear you, and the movement patterns you're starting to notice are your baby's way of communicating.

Care priorities this week:

1. Confirm your anatomy scan is done — if not, book it now (18–22 week window)
2. Start noticing movement patterns — when is your baby most active? This baseline becomes useful in later weeks
3. Manage common discomforts — hydration, fibre, left-side sleeping, and gentle stretching
4. Talk, sing, or play music to your bump — your baby's hearing is developed
5. If the anatomy scan flagged anything, ask for MFM specialist review