Pregnancy Month 4 (Weeks 13–16) — Development, Symptoms & Tips

Second trimester begins. The 'honeymoon trimester' — nausea subsides, energy returns. Baby grows from pea pod to avocado. Bump becomes visible.

PREGNANCY MONTH 4 · WEEKS 13–16 · 2nd TRIMESTER

BABY AT START OF MONTH

🫛

pea pod

MONTH

4

of 9 · Weeks 13–16

Wk 1330–40% completeWk 16

BABY AT END OF MONTH

🥑

avocado

11.6cm · 100g

WEEK-BY-WEEK DEVELOPMENT — MONTH 4 (WK 13–16)

13

Week 13: 2nd trimester begins. Fingerprints forming. Vocal cords developing.

14

Week 14: Neck longer. Baby making facial expressions. Lanugo (fine hair) forming.

15

Week 15: Taste buds forming. Skeletal system developing. Baby may suck thumb.

16

Week 16: Gender possibly visible on ultrasound. Eyes making small movements.

🌸 HOW YOU MAY FEEL

Welcome to the "honeymoon trimester". Energy returns, morning sickness usually gone. Bump becoming visible.

COMMON SYMPTOMS — MONTH 4

Increased energyReduced nauseaVisible bumpNasal congestionIncreased appetiteRound ligament pain

APPOINTMENTS & TESTS — MONTH 4

📋

16-week antenatal check

📋

Quad screen blood test offered (15-20w)

💡 MONTH 4 TIP

Month 4 is when many people share their pregnancy news — the risk of miscarriage has dropped significantly after week 12.

← Month 3

Month 5 →

ALL 9 MONTHS

Month 1Month 2Month 3Month 5Month 6Month 7Month 8Month 9

FREQUENTLY ASKED QUESTIONS

What happens in month 4?

Month 4 (weeks 13-16) — honeymoon trimester begins: Week 13: 2nd trimester begins. Fingerprints forming. Week 14: Baby making facial expressions. Lanugo forming. Week 15: Taste buds forming. Baby may suck thumb. Week 16: Gender possibly visible on ultrasound. Baby size at end of month 4: avocado (~11.6cm, ~100g) Key milestone: energy and appetite return. Bump visible to others.

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Pregnancy month 4 · Weeks 13–16 · 2nd trimester · Sources: ACOG, NHS, WHO