# 9 Weeks Pregnant: Baby Size, Symptoms & What to Expect | Clever Mum > 9 weeks pregnant — your baby is the size of a cherry. What's developing, what you might feel, and what to focus on this week. * [ Home ](/) * › [ Pregnancy ](/pregnancy/) * › [ Week by week ](/pregnancy/week/) * › Week 9 First trimester # 9 weeks pregnant Your baby is about the size of a cherry [ CP ](/authors/parenting-desk/) By [ Clever Mum Parenting ](/authors/parenting-desk/) · Parenting guides Published 11 July 2026 Quick answer — What happens at 9 weeks pregnant? At 9 weeks pregnant, your baby is about the size of a cherry, roughly 2.3cm and around 2g. The embryo is now officially a fetus. 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 9 weeks pregnant? At 9 weeks pregnant, your baby is about the size of a cherry, roughly 2.3cm and around 2g. The embryo is now officially a fetus. The heart has divided into four chambers and tiny muscles are forming, so movements become more frequent (still too small to feel). These are typical averages — your midwife's measurements are the ones that matter for your pregnancy. ## What might you feel at 9 weeks? Most people at 9 weeks notice some mix of the symptoms below — and plenty notice none of them. Symptoms often feel most intense around 9–10 weeks. You may not look pregnant yet but feel it strongly. Mood swings and vivid dreams are common. None of this is a diagnosis; contact your midwife if something worries you. ### Common symptoms this week * Symptoms often at their most intense * Mood swings * Bloating * Breast growth Symptom lists are typical, never exhaustive — and having none of them is normal too. ## What should you do at 9 weeks pregnant? The useful job this week is practical, not medical. Think about when to tell your employer — you're legally entitled to paid time off for antenatal appointments once they know. Pair it with the NHS week-by-week guide if you want a second description of the same stage. ### Week 9 checklist * Plan when to tell your employer — you get paid time off for antenatal care once they know * Keep up folic acid and vitamin D ## What else is useful at 9 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/) ## 9 weeks pregnant: common questions When do I have to tell work I'm pregnant? Legally, by the 15th week before your due date (around week 25) to protect your maternity leave and pay rights — but telling them earlier unlocks paid time off for antenatal appointments and a workplace risk assessment, so many people tell their manager after the 12-week scan. How big is my baby at 9 weeks pregnant? At 9 weeks, your baby is approximately the size of a cherry, about 2.3cm and around 2g. These are approximate averages — every baby grows at its own pace. What's happening at 9 weeks pregnant? The embryo is now officially a fetus. The heart has divided into four chambers and tiny muscles are forming, so movements become more frequent (still too small to feel). For you: symptoms often feel most intense around 9–10 weeks. you may not look pregnant yet but feel it strongly. mood swings and vivid dreams are common. Which trimester is 9 weeks? 9 weeks pregnant is in the first 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 [← 8 weeks](/pregnancy/week/8/) [All weeks](/pregnancy/week/) [10 weeks →](/pregnancy/week/10/) 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 9 at a glance Trimester First trimester Baby size cherry Approx length ~2.3cm Approx weight ~2g Weeks to go 31 (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.