Week 13 of Pregnancy
The second trimester — often called the "honeymoon trimester" — begins.
Fetal size
Peach
- Length
- 7.4 cm
- Crown-rump (CRL)
- Weight
- 23 g
Fetal development
- Fingerprints form.
- Vocal cords develop, though sound is not produced in fluid.
- Intestines fully move into the abdominal cavity.
Maternal changes
- Energy returns and nausea typically fades.
- A small baby bump may start to show.
Recommended checkups
- Confirm timing of the second-trimester quad screen (weeks 15–22).
Jump to week
Textbook averages. Individual variation is wide and this is not medical advice — confirm with your OB.