Second trimester
Pregnancy Week 27
Your baby is about the size of a cauliflower.
Size
cauliflower
Length
37 cm
Weight
870 g
Baby in week 27
Brain activity becomes more complex. Lungs continue maturing.
What you may notice this week
End of second trimester. Possible third-trimester symptoms creeping in.
Tips for week 27
- Begin a hospital bag checklist
- Tour the birthing center
- Decide on a birth plan
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.