Second trimester
15 weeks pregnant
Your baby is about the size of an orange
- First trimester1st trimester weeks 1–12
- Second trimester2nd trimester weeks 13–26
- Third trimester3rd trimester weeks 27–40+
By Clever Mum Parenting · Parenting guides
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How big is the baby at 15 weeks pregnant?
At 15 weeks pregnant, your baby is about the size of an orange, roughly 10.1cm and around 70g. The baby is moving a lot now — stretching, wriggling and even hiccupping — though most first-time parents still can't feel it. They can sense light through closed eyelids. These are typical averages — your midwife's measurements are the ones that matter for your pregnancy.
What might you feel at 15 weeks?
Most people at 15 weeks notice some mix of the symptoms below — and plenty notice none of them. Some people get a stuffy nose or nosebleeds in pregnancy (extra blood flow to mucous membranes). Skin changes like a darkening line down the belly can appear. None of this is a diagnosis; contact your midwife if something worries you.
Common symptoms this week
- Stuffy nose or nosebleeds
- Darkening line down the belly (linea nigra)
- Occasional headaches
Symptom lists are typical, never exhaustive — and having none of them is normal too.
What should you do at 15 weeks pregnant?
The useful job this week is practical, not medical. If you're having the quadruple blood test for Down's syndrome screening, it's usually offered between 14 and 20 weeks. Pair it with the NHS week-by-week guide if you want a second description of the same stage.
Week 15 checklist
- Ask about the quadruple blood test (14–20 weeks) if you missed combined screening
- Drink consistently through the day — headaches in pregnancy are often hydration
What antenatal care is due around 15 weeks?
These appointments, vaccines and deadlines fall around this stage. Your maternity team will confirm your own dates.
- Quadruple test if you missed combined screening. If you are past 14 weeks, the NHS may offer the quadruple blood test between 14 and 20 weeks. It checks for Down's syndrome but is not as accurate as the combined test. NHS: screening in pregnancy
What else is useful at 15 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.
15 weeks pregnant: common questions
Why do I have a stuffy nose in pregnancy?
Pregnancy rhinitis — extra blood flow swells the mucous membranes, causing congestion and easier nosebleeds with no cold behind it. Saline sprays and humid air help; check with a pharmacist before using decongestants, as many aren't recommended in pregnancy.
How big is my baby at 15 weeks pregnant?
At 15 weeks, your baby is approximately the size of an orange, about 10.1cm and around 70g. These are approximate averages — every baby grows at its own pace.
What's happening at 15 weeks pregnant?
The baby is moving a lot now — stretching, wriggling and even hiccupping — though most first-time parents still can't feel it. They can sense light through closed eyelids. For you: some people get a stuffy nose or nosebleeds in pregnancy (extra blood flow to mucous membranes). skin changes like a darkening line down the belly can appear.
What appointments or vaccines are due at 15 weeks pregnant?
Around 15 weeks: quadruple test if you missed combined screening. Your maternity team will confirm the dates that apply to you.
Which trimester is 15 weeks?
15 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
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.