27 WEEKS PREGNANT
The third trimester approaches as brain tissue grows rapidly
Baby this week: about 35.6 cm — head to heel · about 875 g
≈ 35.6 cm — about the size of an eggplant
Illustration enlarged for clarity — the amber marker shows true relative size
Your baby this week
- Brain tissue is growing quickly, and brain activity is increasing
- The fetus has regular sleep and wake cycles now
- Hiccups are common and may be felt as small rhythmic jumps
- The lungs, while still immature, are steadily developing toward being ready for air
Your body this week
- This week typically marks the end of the second trimester
- Rib discomfort can start as the uterus pushes upward
This week's tip: Shifting position or taking a few slow, deep breaths can sometimes ease rib discomfort caused by the growing uterus.
Want the bigger picture — organ development, nutrition, scans and warning signs for this stage? See month 6: Settling into the bump.
Sizes and milestones are typical ranges — every pregnancy runs on its own clock. Educational content; your prenatal care team's guidance always comes first.