First trimester
Pregnancy Week 12
Your baby is about the size of a lime.
Size
lime
Length
54 mm
Weight
14 g
Baby in week 12
Reflexes develop. The fetus can open and close fists. Vocal cords are forming.
What you may notice this week
Risk of miscarriage drops significantly. Belly may start showing.
Tips for week 12
- Consider sharing the news after this week
- Start sleeping on your side
- Get a maternity bra fitting
Tools that pair with this week
Due Date Calculator
Estimate your delivery date by last period or conception date. Naegele’s rule plus cycle adjustments.
Week Tracker
See exactly how many weeks and days pregnant you are, plus your trimester and key milestones.
Contraction Timer
Tap once to start, once to stop. Tracks duration, frequency, and pattern over time.
Ovulation Calculator
Find your fertile window based on your cycle length. Plan or avoid with confidence.
Baby Name Generator
Filter by origin, style, length, and starting letter. Boys, girls, and unisex.
Growth Percentile
Plot your baby’s weight, length, and head circumference against WHO percentile curves.