Pregnancy week 13
This week your baby is about the size of lemon — around 7.4 cm and 23 g.
Your baby this week
Your baby is now about the size of a lemon, and this is the last week of the first trimester. The vocal cords are beginning to form, and unique fingerprints are developing on those tiny fingertips. The body is now growing faster than the head, becoming more balanced in proportion. The intestines, which had been developing outside the body, are also moving into their place in the abdomen.
Your body this week
You may feel more comfortable this week as nausea fades and your energy gradually returns. It's common to notice your breasts growing larger and perhaps a faint dark line appearing down your belly, known as the linea nigra. These changes vary from woman to woman and are all a natural part of the pregnancy journey.
Tips for this week
If your energy is back, this can be a nice time for gentle activity such as walking or pregnancy-safe exercise, after checking with your doctor. Take care of your skin by moisturizing gently as it stretches. And start thinking calmly about your plans for the months ahead, without putting pressure on yourself.
Frequently asked questions
How big is the baby at week 13?+
At week 13, your baby is about the size of lemon — roughly 7.4 cm and 23 g, though every baby grows at its own pace.
Which trimester is week 13?+
Week 13 falls in the First trimester.
How many weeks are left at week 13?+
At week 13, you have about 27 weeks to go until the typical 40-week due date.
Is week 13 normal?+
Every pregnancy is different. If you feel well and your check-ups are on track, week 13 is usually a normal part of the journey — but always reach out to your doctor or midwife with any concern.
This guide is for general information and reassurance — it isn't medical advice. Always follow your doctor or midwife for your own pregnancy.