Baby by Week
By Muhammed Shuweck · Updated 11 August 2026
Week 25

Your week 25 guide

Hearing, reflexes, sleep cycles and breathing practice are all becoming better established. Your baby is beginning to behave in ways that will be recognisable after birth. SubhanAllah, these small rehearsals belong to a much bigger story.
Trimester

2

Month

6

Weeks left

15

Size at a glance

Comparison
Ear of corn
Length
≈ 23 cm crown to rump
Weight
1.5 lb
Measurements are approximate. Healthy babies grow at different rates.

Baby development

The vocal cords have formed. They cannot be used in the womb because there is no air passing over them, and the first sound your baby makes will be after the first breath. Their structure is complete well ahead of the moment they are needed.
Your baby is developing a sleep schedule that may not match yours. Distinct periods of rest and activity are emerging, and they are set by your baby's own developing rhythm rather than by day and night. This is why the quiet moment when you finally lie down is so often when the movement starts.
Reflexes are developed enough that a sudden sound or movement can cause a startle. The startle reflex is the same one you will see in your newborn when a door slams. It shows that hearing and the nervous system are connected and responding, not simply present.

Your body

Breathlessness, snoring, heartburn, restless legs or carpal tunnel symptoms may appear. Restless legs, an uncomfortable urge to move them at night, is more common in pregnancy and is sometimes linked to low iron, so it is worth mentioning. Breathlessness on exertion is expected; breathlessness that comes on suddenly, at rest, or with chest pain is not and needs urgent attention.
Hair may feel thicker and movement is becoming easier to recognise. You may start to distinguish a foot from an elbow, and to notice when your baby is usually active. Building that familiarity now is what makes a change in the pattern meaningful later.
A glucose screening test may be scheduled around this stage. It is a routine offer rather than a sign of concern, and being asked to take it does not imply anything about your health or weight. Ask beforehand whether you need to fast, since the requirements differ between services.

This week's checklist

Ask about breast pump access through your insurer or local service if that is relevant where you live. In some countries pumps are provided or funded, and in others they are not, so it is worth finding out rather than assuming. There is no need to buy one now regardless. InshaAllah, checking what is available can spare an unnecessary purchase.
Check current safety guidance before choosing a cot, pushchair, carrier or car seat. Standards change and second-hand car seats in particular can have an unknown history, which matters because a seat involved in a collision should not be reused. Sleep safety guidance is worth reading directly from a health source rather than from a retailer.
Notice your baby's emerging movement pattern without comparing it to anyone else's. Every baby has their own rhythm, and there is no correct number of movements. Knowing what is usual for your baby is what allows you to recognise a change, which is far more useful than any count.
Iodine: Iodine is used to make thyroid hormones and contributes to your baby's brain and nervous system development. The iodine content of foods varies considerably between countries.
Sources include dairy products, eggs, suitable fish and seafood, iodised salt and fortified foods. Do not simply increase your salt intake or start an iodine supplement without checking local guidance or speaking to a qualified professional, because too much iodine can also affect thyroid function.

Call your care team

Contact your maternity team immediately about reduced, absent or changed movements, bleeding, leaking fluid, regular painful contractions or fever. Do not wait for your next appointment.
Seek urgent help for a severe headache or vision changes, chest pain, fainting, major difficulty breathing, or severe abdominal pain.

Medical information, not medical advice

Every pregnancy is different. Use this guide for general education and follow the advice of your own maternity care team. Do not delay urgent care because of something you read here.