Pregnancy Week By Week

18 Weeks Pregnant: Development, Symptoms and Care

At 18 weeks pregnant, you may be approaching your morphology scan and beginning to recognise your baby’s movements. It is also possible not to have felt them yet. This stage can bring excitement, uncertainty and some very ordinary discomforts, sometimes all on the same day.

Your baby’s development at 18 weeks

Meconium, the material that will make up your baby’s first stools, is collecting in the bowel. Your baby is also moving in the uterus. Whether you can feel those movements yet is different from whether they are happening.

Body changes and everyday comfort

Heartburn, bloating and constipation can be uncomfortable. Smaller meals may help with indigestion, while fluids, fibre and manageable activity can help constipation. Ask a pharmacist or your clinician about pregnancy-suitable treatments if these steps are not enough.

You may feel light-headed when standing up quickly. Rise slowly, but do not assume dizziness is harmless: contact your care team straight away, especially if it is ongoing or occurs with pain or bleeding. Fainting or feeling severely unwell needs urgent help.

Movements at 18 weeks

Most people first feel movement between 16 and 24 weeks. The first sensations may be soft flutters, and a first pregnancy can take longer to recognise than a later pregnancy. There is no set number of movements that applies to every baby.

Contact your maternity team immediately if movements seem reduced, change in a way that concerns you or you are otherwise worried. Do not wait overnight. If you cannot reach them, go to the nearest hospital maternity or emergency unit. A home Doppler must not replace assessment.

Your anatomy scan: what to expect

The morphology scan is usually offered around 18 to 22 weeks. It examines the baby’s anatomy and growth and checks the placenta. Ask your care team which week they recommend and how to organise it. You can choose whether to have the scan after discussing its purpose.

Ultrasound cannot identify every condition. A reassuring result is useful information, not a guarantee about every aspect of your baby’s health. If something needs a closer look, ask what has been seen, what remains uncertain and what further assessment is being offered.

You can ask whether a support person may come and whether there are any costs. Tell the sonographer if you would prefer not to know the baby’s sex. Make sure you know who will explain your report and when. Our guide to prenatal tests can help you prepare.

Your wellbeing matters too

If worry, sadness or a loss of interest is affecting you, tell your midwife or GP. Support belongs in pregnancy care, not only after birth. You can also ask a trusted person for something concrete, such as company at the scan, a meal or help with an everyday task.

There is no requirement to feel instantly connected to the baby or to enjoy every change. Giving yourself space to talk honestly is more useful than trying to perform a particular version of pregnancy.

When to seek medical help

In Australia, call 000 for heavy bleeding, severe abdominal pain, collapse or a life-threatening emergency. Do not drive yourself if faint or very unwell.

Contact your GP, midwife or hospital immediately for vaginal bleeding, leaking fluid, fever, vomiting that prevents drinking, persistent or worsening pain, severe headache or vision changes. Seek urgent care if you cannot reach them. Do not wait for your next routine appointment.