First Trimester
12 Weeks Pregnant
Your baby is the size of a Lime 🍋
🍋
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Lime
📐
Length
5.4 cm cm
⚖️
Weight
NaN g
🗓️
Trimester
First
⏱️
Week
12 of 40
🌱 Baby Development at Week 12
Baby has developed reflexes. Fingers can curl around objects. Digestive system is practicing contractions. Bone marrow makes white blood cells. Most birth defect risks decrease after this week.
Reflexes developingMost birth defect risk reducesFingers can curl
🤱 Common Symptoms
●First trimester symptoms easing for many
●Uterus moves above pubic bone
●Smaller bump visible
●Constipation persists
🥗 Nutrition Tips
- Calcium and Vitamin D for baby's bone development
- Magnesium for leg cramp prevention
- Healthy snacks every 3 hours
🏃♀️ Exercise Tips
- Most prenatal exercises safe
- Low-impact cardio 3-4x/week
- Pelvic floor exercises essential
🏥 Medical Tests & Appointments
NT scan (if not done at 11 weeks)First trimester screening blood test
🔬 Hormone Changes
Progesterone and estrogen stabilize from placenta. Morning sickness often begins to ease as hCG drops.
Frequently Asked Questions
Common questions answered by our medical team