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Pregnancy

Week by week changes, symptoms, nutrition, work, travel and the problems that can come up along the way.

In this topic

Twins and multiples

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Pregnancy complications

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Start with the calendar

The week-by-week guide is complete for all 42 weeks.

4

Week 4: a missed period and a positive test

About the size of a poppy seed

Implantation finishes and the embryo starts forming the structures that will support it: the amniotic sac, the yolk sac and the beginnings of the placenta. A home test can turn positive from about now.

12

Week 12: the dating scan

About the size of a lime · 14 g

Your baby can curl its toes, clench its fists and make sucking movements. The intestines move into the abdomen and the kidneys produce urine. Many parents share the news after this week's scan.

20

Week 20: halfway there

About the size of a banana · 300 g

You are at the midpoint. Your baby swallows regularly, produces meconium in the bowel and is starting to develop taste buds. The anatomy scan usually happens around now.

28

Week 28: the third trimester

About the size of an aubergine (eggplant) · 1 kg

Your baby can blink, has eyelashes and dreams in REM sleep. Fat is layering up and the brain is forming its characteristic grooves. Appointments now become more frequent, and you will be asked about movements at each one.

37

Week 37: early term

About the size of a bunch of Swiss chard · 2.9 kg

From 37 weeks and 0 days your baby is early term. Breathing, grasping and sucking are practised daily and the head is likely engaged. Lungs and brain still benefit from every extra day until 39 weeks.

40

Week 40: your due date

About the size of a small pumpkin · 3.5 kg

This is the week of your due date, but most babies arrive within two weeks either side of it. Your baby is fully developed and still adding fat. The skull bones will overlap slightly during birth.

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