# 20 Weeks Pregnant: Baby Size, Symptoms & What to Expect | Clever Mum > 20 weeks pregnant — your baby is the size of a banana. What's developing, what you might feel, and what to focus on this week. * [ Home ](/) * › [ Pregnancy ](/pregnancy/) * › [ Week by week ](/pregnancy/week/) * › Week 20 Second trimester # 20 weeks pregnant Your baby is about the size of a banana [ CP ](/authors/parenting-desk/) By [ Clever Mum Parenting ](/authors/parenting-desk/) · Parenting guides Published 11 July 2026 Quick answer — What happens at 20 weeks pregnant? At 20 weeks pregnant, your baby is about the size of a banana, roughly 25.6cm and around 300g. You're halfway there. Who should skip this Skip this page if you need personal medical advice — it is general NHS-aligned information, not a substitute for your midwife. If your baby's movements slow or change, call your maternity unit, not a website. ## How big is the baby at 20 weeks pregnant? At 20 weeks pregnant, your baby is about the size of a banana, roughly 25.6cm and around 300g. You're halfway there. From now, length is measured head-to-heel. The baby is swallowing amniotic fluid and producing meconium (first poo). They have regular sleep-wake cycles. These are typical averages — your midwife's measurements are the ones that matter for your pregnancy. ## What might you feel at 20 weeks? Most people at 20 weeks notice some mix of the symptoms below — and plenty notice none of them. Most people have a clear bump by now and many feel regular movements. This is often when the anomaly scan happens. You might feel more energetic and comfortable. None of this is a diagnosis; contact your midwife if something worries you. ### Common symptoms this week * Clear, established bump * Regular noticeable movements * Feeling more comfortable than either end of pregnancy Symptom lists are typical, never exhaustive — and having none of them is normal too. ## What should you do at 20 weeks pregnant? The useful job this week is practical, not medical. After the 20-week scan is a good time to start researching big purchases — pushchair, car seat and cot have the longest lead times. Pair it with the NHS week-by-week guide if you want a second description of the same stage. ### Week 20 checklist * Attend the anomaly scan — a detailed development check of heart, brain, spine, limbs and placenta position * Ask for your MATB1 certificate from around now — it unlocks maternity pay * Start researching the big purchases (pushchair, car seat, cot) ## What else is useful at 20 weeks? Use the week page for size and symptoms; use the guides below for the decisions that actually sit in this window — pay, packing, car seats, labour signs. * [Due date calculator](/tools/due-date-calculator/) * [Trimester to-do list](/pregnancy/pregnancy-to-do-list-by-trimester/) * [Maternity leave and pay](/pregnancy/maternity-leave-and-pay-uk/) * [Best infant car seats](/best/best-car-seats-uk/) ## 20 weeks pregnant: common questions What does the 20-week anomaly scan check? A detailed structural check of the baby — brain, face, spine, heart, stomach, kidneys, limbs — plus the placenta's position and amniotic fluid. Most scans are reassuring; if anything needs a closer look you'll be referred to a specialist, usually within days. How big is my baby at 20 weeks pregnant? At 20 weeks, your baby is approximately the size of a banana, about 25.6cm and around 300g. These are approximate averages — every baby grows at its own pace. What's happening at 20 weeks pregnant? You're halfway there. From now, length is measured head-to-heel. The baby is swallowing amniotic fluid and producing meconium (first poo). They have regular sleep-wake cycles. For you: most people have a clear bump by now and many feel regular movements. this is often when the anomaly scan happens. you might feel more energetic and comfortable. Which trimester is 20 weeks? 20 weeks pregnant is in the second trimester. The first trimester runs to the end of week 12, the second from weeks 13 to 26, and the third from week 27 to birth. ## Sources & further reading * [ You and your baby at 4 to 40 weeks pregnant ](https://www.nhs.uk/pregnancy/week-by-week/) — NHS * [ Your baby's movements ](https://www.nhs.uk/pregnancy/keeping-well/your-babys-movements/) — NHS [← 19 weeks](/pregnancy/week/19/) [All weeks](/pregnancy/week/) [21 weeks →](/pregnancy/week/21/) This is general information, not medical advice — every pregnancy is different. For anything that worries you, and for all your antenatal care, speak to your midwife or GP. If your baby's movements ever slow down or change, contact your maternity unit immediately, day or night. Reviewed August 2026. ## Week 20 at a glance Trimester Second trimester Baby size banana Approx length ~25.6cm Approx weight ~300g Weeks to go 20 (to 40) Work out your dates Not sure how many weeks you are? Our [due date calculator](/tools/due-date-calculator/) maps your weeks and trimester dates from your last period.