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 6 of pregnancy
Your baby is the size of a lentil. Buds for the arms and legs appear, and the heartbeat can sometimes be seen on a scan.
Your baby is the size of a lentil
- Length, head to bottom
- ≈ 5 mm
Your baby this week
- Small buds appear that will grow into arms and legs.
- The eyes and ears begin to form, as small dips on the sides of the head.
- The heart beats fast and can sometimes be seen on an early scan.
- The embryo has a small tail, which disappears over the coming weeks.
Your body this week
- Feeling and being sick are common and often worse when you are tired or have an empty stomach.
- Tiredness can be overwhelming; progesterone makes you sleepy.
- You may feel bloated, be constipated or notice smells more than usual.
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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.