First Trimester
13 Weeks Pregnant
Your baby is the size of a Peach 🍑
🍑
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Peach
📐
Length
7.4 cm cm
⚖️
Weight
NaN g
🗓️
Trimester
First
⏱️
Week
13 of 40
🌱 Baby Development at Week 13
Welcome to the second trimester! Baby's fingerprints are forming. Vocal cords are developing. The intestines are moving from the umbilical cord into the abdomen. Bone is replacing cartilage throughout the body.
Second trimester begins!Fingerprints formingBone replacing cartilage
🤱 Common Symptoms
●Energy returns for most women
●Reduced nausea
●Increased appetite
●Possible nasal congestion
●Round ligament pain
🥗 Nutrition Tips
- Calcium 1000mg/day essential
- Iron 27mg/day recommended
- Increase caloric intake by ~300 calories
🏃♀️ Exercise Tips
- Second trimester is often easiest for exercise
- Prenatal yoga, swimming, walking all great
- Begin modifying exercises that involve lying on back
🏥 Medical Tests & Appointments
Second trimester begins — reduced test frequencyOptional NIPT results available if taken
🔬 Hormone Changes
Estrogen increases to support uterine growth. Blood volume increases 40-50% throughout pregnancy — starts ramping up now.
Frequently Asked Questions
Common questions answered by our medical team