Week by weekTrimester 1

Week 12 — size of a plum.

A two-minute partner brief: how baby is growing, what's changing for her, and one practical thing you can do this week.

For her

Hormone shifts can bring fatigue, nausea, tender breasts and emotional ups and downs.

For baby

About the size of a plum. Organs and senses are developing on schedule.

Partner action this week

Give a slow 10-minute lower-back massage.

Red flag

Severe nausea preventing fluids — seek care promptly.

Educational guidance, not medical advice. If you're worried about symptoms, contact your midwife, GP or maternity unit.

Plan ahead with partner tools.

Due date, trimester tracker, appointment timeline — built for partners.

Open calculators