Week 5: Your Baby is the Size of a Sesame Seed
Morning sickness may begin this week, and it can happen at any time of day. You might find that certain smells or foods make you feel queasy. Progesterone is making you feel exhausted, and you may need to nap more often.
Your baby at week 5
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Size of a Sesame seed
Baby Development
The embryo's heart is one of the first organs to form and is already beginning to beat, though it is too early to detect on ultrasound. The neural tube, which becomes the brain and spinal cord, is developing. Tiny buds that will become arms and legs are starting to appear. The circulatory system is the first major system to function.
Week 5 Highlight: Your baby's tiny heart has already started beating - about 80 times per minute and getting faster!
Common Symptoms
Tips for Week 5
Eat small, frequent meals to manage nausea.
Keep dry crackers by your bed for morning sickness.
Rest when you can - the first trimester is exhausting.
Start a pregnancy journal to track your symptoms and milestones.
South Africa Specific Info
Book your first antenatal visit at your local clinic or with your gynae. In the public sector, your first visit should be before 12 weeks. At this visit, you will be registered in the Maternity Case Record. HIV testing is routinely offered at the first visit as part of South Africa's PMTCT (Prevention of Mother-to-Child Transmission) programme.
All Pregnancy Weeks
Frequently Asked Questions
About the Author
Due Date Calculator SA Editorial Team
Our content is reviewed by healthcare professionals familiar with South African maternal health practices. We combine evidence-based medical information with local knowledge to support South African mums throughout their pregnancy journey. Our team includes contributors with backgrounds in midwifery, obstetrics, and maternal health education.
Last reviewed: February 2026