Week 12: Your Baby is the Size of a Plum
You may start to feel better as the first trimester ends. A small bump may be visible, especially if this is not your first pregnancy. The risk of miscarriage drops significantly after 12 weeks, which is why many people choose this time to share their news.
Your baby at week 12
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Size of a Plum
Baby Development
The foetus's digestive system is practising contraction movements. The bone marrow is starting to produce white blood cells to fight infection after birth. The pituitary gland at the base of the brain is beginning to produce hormones. Reflexes are developing - the baby will move if you prod your abdomen, though you can't feel it yet.
Week 12 Highlight: Your baby's face is now fully formed with all features in place - they even have a unique facial profile!
Common Symptoms
Tips for Week 12
This is when many people choose to announce their pregnancy.
Schedule your dating scan ultrasound if not done yet.
Begin thinking about your birth plan preferences.
Research antenatal classes available in your area.
South Africa Specific Info
The dating scan (first ultrasound) is typically done around 12 weeks in both public and private sectors in South Africa. This confirms your due date, checks for multiples, and screens for certain conditions. In the public sector, this may be the only routine ultrasound offered (along with the anomaly scan at 20 weeks). Nuchal translucency screening is performed between 11-14 weeks.
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