Pregnancy week 17

Your baby’s development

At 17 weeks your baby is about the size of a pear. This week fat begins to build up under the skin, which will help keep the baby warm after birth. The skin is still very thin, but the fat layer will gradually make your baby look fuller. The umbilical cord thickens and strengthens, while the placenta keeps delivering oxygen and nutrients. The skeleton continues to harden, and the tiny bones of the ear join in. Sweat glands develop, and the fingertips form their own unique pattern of prints. Your baby moves more often: stretching, yawning and sometimes startling. The heart beats at roughly 140 to 150 beats a minute, much faster than yours. Let these details be reassuring: things are quietly moving along, and the measurements are only averages. Development moves at its own pace in every pregnancy; your doctor interprets ultrasound measurements, and small differences are usually ordinary.

Changes in the mother

As your belly grows, your centre of gravity shifts, so your balance may feel a little different at times. Paying attention to posture can ease back and waist aches. Sitting upright, not staying in one position for too long, and wearing comfortable, supportive shoes all help. Your appetite may have increased, which is common. Your doctor's advice is what counts when it comes to weight gain. Some people notice mild tingling in the hands, a runny nose or dizziness. Getting up quickly from lying or sitting can make you lightheaded, so move slowly. If you feel dizzy after a hot shower, sit down for a while. Most of this eases with time. Leaving room for rest and being kind to yourself are part of this stage as well.

To do this week

• Review your posture and support your back when sitting.
• Ask your doctor which kinds of exercise suit your pregnancy.
• Try relaxation and deep-breathing exercises.
• Start a list of first things you would like to prepare for the baby.

Tip for the partner

Taking on the heavy, tiring household tasks is the most practical kind of support.

Nutrition tip

Small, frequent meals may help ease nausea and heartburn.