Key takeaways
- In the third month, your baby is about 6–7 cm — the size of a lime.
- Fingers and toes fully formed is a key milestone this month.
- Common symptoms include nausea usually improves and constipation.
- This month's key check: NT scan.
By the third month (weeks 9–12), your baby's fingers and toes are fully formed and it has started to move — though you won't feel it yet. Your baby is now about the size of a lime (6–7 cm), and the first trimester is ending.
How big is the baby in the third month?
Your baby is about 6–7 cm, roughly the size of a lime.
What is developing this month?
Key milestones in the third month include:
- Fingers and toes fully formed
- Baby starts moving
- Kidneys begin functioning
- External genitalia develop
What symptoms can you expect in the third month?
Every pregnancy is different, but common symptoms this month include:
- Nausea usually improves
- Constipation
- Bloating
- Increased appetite
What should you do this month?
- Continue your prenatal vitamins
- Eat a high-fibre diet with plenty of fluids for constipation
- Attend your first-trimester screening
- Keep up gentle activity such as walking or prenatal yoga
Which tests or scans are done in the third month?
The third month is when the important first-trimester screening is done.
- The NT scan (nuchal translucency) with the combined/double marker test (around 11–13 weeks) to screen for chromosomal conditions
- NIPT (non-invasive prenatal test) as an option where advised
- Routine blood pressure, weight and urine checks