Morning sickness
Why nausea and vomiting happen in pregnancy, when they ease, what helps and when to call a doctor.
3 min read
First trimester
Week 9 of pregnancy
Your baby is the size of a cherry. The little tail has gone, muscles are developing and eyelids cover the eyes.
Your baby is the size of a cherry
- Length, head to bottom
- ≈ 2.3 cm
- Weight
- ≈ 2 g
Your baby this week
- The embryo’s tail disappears and the body starts to look more like a baby’s.
- The eyelids are forming and will keep the eyes closed until around week 26.
- Muscles develop, so movements become more frequent.
- The heart now has four chambers, like an adult heart.
Your body this week
- For many women nausea is at its strongest around weeks 9 to 10.
- You may have headaches, heartburn or feel bloated.
- Hormonal changes can make you more sensitive and emotional.
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General information written by the mam.al editors. Every pregnancy is different and sizes are averages; it does not replace advice from your doctor or midwife. Sources include the NHS week-by-week guide to pregnancy. NHS. Contains public sector information licensed under the Open Government Licence v3.0.