20 weeks pregnant: your baby & body
Your baby this week
About 25.6 cm and 300 g — around the size of a banana. Every baby grows a little differently.
How your baby is developing
- This is the halfway point of a typical pregnancy; the mid-pregnancy anomaly ultrasound is usually offered around now (weeks 18–22).ACOG
- The fetus is typically swallowing more amniotic fluid, and lanugo hair covers much of the body.UNSW Embryology (CC-BY)
How you may feel
- Most people feel regular movement by now.ACOG
- Stretching skin may cause itching, and Braxton Hicks ('practice') contractions can begin.NHS
Nutrition this week
Tests & scans
- Anomaly (mid-pregnancy) ultrasound (weeks 18–22)
When to reach out
- Heavy vaginal bleeding or passing clots.ACOG
- Severe or persistent abdominal or pelvic pain.ACOG
- Severe, persistent nausea or vomiting that prevents keeping any fluids down (possible hyperemesis gravidarum).NHS
- Fever of 38°C (100.4°F) or higher, or chills.WHO
- Severe dizziness, fainting, or a racing/irregular heartbeat.NHS
- Pain or burning when urinating (possible urinary tract infection).NHS
- A severe or persistent headache that doesn't improve.ACOG
- Sudden swelling of the face, hands, or feet.ACOG
- Visual disturbances — blurring, flashing lights, or spots.ACOG
- Fluid leaking or gushing from the vagina (possible ruptured membranes).NHS
- Persistent pain in the upper abdomen, especially under the ribs on the right side.ACOG
These apply to this week specifically. See the full list of urgent warning signs the CDC publishes for pregnancy and the year after birth.
Part of the Second trimester (weeks 14–27).
Educational reference only — not medical advice. Typical/average figures; every pregnancy differs. Always consult your doctor or midwife. Seek urgent care for any warning sign.