Trimester 1
Week 13
Your baby is about the size of a peach.
Length: 7.4 cm · Weight: 23 g
Common this week: Reduced nausea, Returning energy, Round ligament pain, Increased appetite.
Baby development
- Unique fingerprints are forming on tiny fingertips.
- The baby can now make sucking movements.
- Bone marrow is beginning to produce white blood cells for the immune system.
- The placenta is now fully formed and supporting all the baby's needs.
Changes for you
- Welcome to the end of the first trimester — for many, symptoms begin to ease.
- Energy levels often return as progesterone stabilises.
- A small bump may be visible, especially in second pregnancies.
- Your skin may look radiant, or you may experience dryness or acne.
Tips
- Celebrate making it through the first trimester — it's a big milestone.
- Now is a great time to start prenatal exercise if you haven't already.
- Consider booking a dentist appointment — gum health affects pregnancy outcomes.
- Start researching antenatal classes and hospital tours in your area.
Appointments
- Second trimester starts next week — confirm your next antenatal appointment schedule with your provider.
Warning signs
- Any vaginal bleeding
- Unusual discharge (green, foul-smelling)
- Fever
Australian notes
- Congratulations — the risk of miscarriage is now significantly reduced.
- Many Australian workplaces require formal notification of pregnancy around this time to access flexible work entitlements.