Your baby at 12 weeks
The organs and muscles have grown, and the heartbeat can be seen on a scan.
The skeleton is hardening from soft tissue into bone, and the sex organs have formed, though most scans can't tell the sex yet.
Your body at 12 weeks
As sickness eases for many people, you may feel hungrier.
Most pregnant women gain between 10kg and 12.5kg in total, mostly after 20 weeks.
The 12-week scan is often the first time it feels real. Take someone with you if you can.
Your to-do list at 12 weeks
- Your dating scan will be offered around now.
- Think about where you'd like to give birth, and visit local maternity units if you can.
- You can tell your employer whenever you're ready, and ask for a workplace risk assessment.
When to call your midwife
Contact your midwife, GP or NHS 111 if you have bleeding, tummy pain or severe sickness where you can't keep fluids down. Call 999 if you have heavy bleeding, severe pain, pain in the tip of your shoulder or feel faint, as these can be signs of an ectopic pregnancy.
How big is my baby at 12 weeks pregnant?
At 12 weeks, your baby is about 5.4cm from head to bottom.
How many months is 12 weeks pregnant?
12 weeks pregnant is around 3 months, in the first trimester.
What should I do at 12 weeks pregnant?
Your dating scan will be offered around now.
Keep reading
- Pregnancy week by week: the complete guide
- Due date calculator: when is my baby due?
- Your pregnancy to-do list, trimester by trimester
- Your rights when you're pregnant in the UK: the 2026 guide
This guide is general information based on NHS week-by-week guidance, not medical advice. Every pregnancy is different, and baby sizes are averages. If you're worried about anything, contact your midwife, GP or maternity unit. See the NHS week-by-week guide.
If you’re trying to conceive (TTC), you probably know that there are certain foods and nutrients that become especially important once you’re pregnant. But nutrition plays a vital role even when trying to conceive, much like laying a strong foundation before constructing a house.
Certain nutrients create that foundation by supporting egg and sperm health (yes, nutrition matters for both partners), hormone balance and creating a hospitable environment for a fertilized egg to implant. In fact, studies show that certain nutrients can help increase fertility and improve success rates for both natural conception and fertility treatments.
In other words, nutrition is a key player in the TTC journey, but getting the right nutrients in the right quantities can be tricky. That’s where supplements come in. Just as you’d take a multivitamin to fill in nutritional gaps for optimal health, fertility supplements can give you that extra nutrient boost.
Choosing supplements for your fertility journey
When choosing a supplement to support your fertility journey, look for science-backed, high-quality ingredients. Our editors are careful to select and partner with brands that use ingredients that have been clinically studied to support fertility. Eu Natural® (pronounced you) covers all those bases and more. We love knowing that Eu Natural® products contain zero artificial additives, binders, or fillers and are lab-tested to ensure purity and potency.
When choosing a supplement to support your fertility journey, look for science-backed, high-quality ingredients. Our editors are careful to select and partner with brands that use ingredients that have been clinically studied to support fertility. Eu Natural® (pronounced you) covers all those bases and more. We love knowing that Eu Natural® products contain zero artificial additives, binders, or fillers and are lab-tested to ensure purity and potency.
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