All weeks
First Trimester
Week 13 of pregnancy
Your baby is the size of a peach.
Length: 7.4 cm / 2.9 in · Weight: 23 g / 0.8 oz
Baby at 13 weeks
- Last week of first trimester (or first of second, depending on system).
- Baby can pee — amniotic fluid recycling.
- Bones in arms + legs lengthening.
What you may feel
- Energy + mood lifting.
- Reduced miscarriage risk.
- Mild constipation.
- Visible 'pregnancy glow' (some).
This week’s checklist
- Start pelvic floor exercises (Kegels).
- Plan how to share pregnancy news.
- Look into pregnancy classes (NCT, antenatal yoga).
Key milestone
Miscarriage risk drops significantly — first-trimester milestone.
Doctor / midwife visits
Combined screening results received this week if not already.
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.