All weeks
First Trimester
Week 12 of pregnancy
Your baby is the size of a lime.
Length: 5.4 cm / 2.1 in · Weight: 14 g / 0.5 oz
Baby at 12 weeks
- Fingerprints forming.
- Vocal cords developing.
- Intestines moving into the abdomen.
- Heartbeat clearly audible on Doppler.
What you may feel
- End of first trimester — nausea usually easing.
- Energy returning.
- Bump becoming visible.
- Less frequent urination as uterus rises.
This week’s checklist
- 12-week dating scan + combined screening.
- Tell wider family / friends if you want to announce.
- Review job, exercise, travel plans.
Key milestone
12-week scan — most parents' first 'official' view of baby.
Doctor / midwife visits
NHS 12-week dating scan + combined screening + nuchal translucency.
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.