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  1. Home
  2. Pregnancy
  3. Week by Week
  4. Second Trimester
  5. Week 15

Pregnancy Week 15

Fetal Development at week 15
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Baby development this week

At 15 weeks pregnant, your baby is entering a phase of rapid growth. They may be around 10cm long from head to bottom — about the size of an apple — although babies vary.

Your baby’s movements are becoming more varied, although they are still too small and subtle for most people to feel. They can make small movements such as turning their head, opening their mouth, moving their hands and bending their wrists.

The hands are becoming more capable too, with early grasping-like movements and the ability to make a tiny fist. These movements are useful practice, helping the brain, nerves and muscles work together more smoothly.

Did you know?

Around now, your baby is growing a very fine layer of soft hair called lanugo. It helps protect the skin and is usually shed before birth, although some babies are born with a little still visible. 

What's happening to your body

At 15 weeks pregnant, you may begin to notice mild swelling in your ankles or feet, especially later in the day, after standing for a long time, or in warm weather. This can happen because your body is carrying more fluid and pregnancy affects your circulation.

Mild swelling in the feet and ankles can be common, but do not ignore swelling completely. Keep an eye on where it appears, how quickly it comes on, and whether it improves with rest.

Mention swelling at your routine appointments, especially if it is becoming uncomfortable or persistent. Seek advice promptly if swelling is sudden, severe, affects your face or hands, or comes with symptoms such as a bad headache, vision changes, pain high in your tummy, or feeling very unwell.

You may also notice:
  • a fuller lower abdomen
  • tighter waistbands
  • changes in balance or posture
  • occasional aches as your body adjusts
  • more visible veins
  • continued heartburn, bloating or constipation
The practical approach this week is simple: move regularly, elevate your feet when you can, drink enough fluids, and avoid standing still for long stretches.

How you might be feeling

By Week 15, many people are keen to feel the baby move. You know your baby is active, but you probably still cannot feel it yet, especially if this is your first pregnancy.

That can feel frustrating. Movement is one of the first ways pregnancy starts to feel interactive, so waiting for it can make this stage feel a little abstract.

You may hear stories from people who felt movement very early, but try not to use that as your benchmark. First movements are often subtle and easy to miss. They can feel like bubbles, flutters, pops or tiny muscle twitches, and they are more commonly noticed a bit later.

A gentle reminder

You do not need to lie still every evening trying to detect something. The next few weeks may bring a new kind of awareness, but there is no rush to perform pregnancy correctly.

Things to think about this week

This week, focus on circulation, comfort and body awareness.

If swelling is bothering you, try:
  • short walking breaks during the day
  • putting your feet up when resting
  • drinking fluids regularly
  • wearing comfortable shoes
  • avoiding socks or clothes that dig in tightly
  • mentioning swelling at your next appointment if it is persistent or uncomfortable

Small step for this week

If your feet are swelling by evening, try a ten-minute reset: shoes off, feet up, water nearby, and a few gentle ankle circles.
Start learning what early baby movement can feel like, but do not worry if you feel nothing yet. Most people feel first movements later than this, particularly in a first pregnancy.

Questions About This Week?

Every pregnancy unfolds a little differently. If something feels unclear or you just want reassurance, ask your question and hear from parents who understand.

Ask a question

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