All weeks
Second Trimester
Week 18 of pregnancy
Your baby is the size of a sweet potato.
Length: 14.2 cm / 5.6 in · Weight: 190 g / 6.7 oz
Baby at 18 weeks
- Baby can yawn + hiccup.
- Gender visible on ultrasound.
- Inner ear bones harden — baby hears more clearly.
What you may feel
- Round ligament pain (sharp groin twinges).
- Visible movements (some women).
- Bigger appetite.
- Lower back ache.
This week’s checklist
- Anomaly scan booking (18-22 weeks).
- Start sleeping on left side consistently.
- Consider pregnancy support belt for back.
Key milestone
Anomaly scan window opens (18-22 weeks).
Doctor / midwife visits
Anomaly scan + sex reveal (18-22 weeks).
Top foods this week
Educational only — not medical advice. Always consult your midwife or GP. Sources: NICE NG201 antenatal care, NICE NG207 inducing labour, NHS, RCOG. Read the full medical disclaimer.