Second trimester · 17 weeks to go
| Fact | Week 23 |
|---|---|
| Days of pregnancy | 155–161 since LMP |
| Gestational age span | 22w0d to 22w6d |
| Trimester | Second trimester (weeks 14–27) |
| Pregnancy month | Month 2 (weeks 5–8) |
| Average length | 11.4 in (crown to heel) |
| Average weight | 1.1 lb |
| Size comparison | a large mango |
| Weeks remaining | 17 (40-week due date) |
Week 23 thickens the skin and starts filling out that wrinkled look with fat. Loud noises from outside can now produce a measurable reaction, and the baby's hearing will keep sharpening until birth.
The lungs practice breathing motions, though the air sacs aren't ready for real air. Skin is still translucent-red but losing some see-through quality. Blood vessels in the lungs develop to prepare for that first breath.
Gestationally, week 23 means you are 22 weeks and 0 to 6 days pregnant, day 155 to day 161 counted from the first day of your last period. This is week 10 of the second trimester (weeks 14–27). Prenatal appointments run about every four weeks in this stretch. Week 24 brings viability and the opening of the glucose-test window (weeks 24–28). Across this trimester the baby more than triples in weight, so expect your bump, your appetite, and eventually your waddle to keep pace with the calendar. Every number on this page is an average across pregnancies; your own scan dates and your baby's measurements are what actually describe your week 23.
Sleep propped up to quiet the snoring. Watch for sudden facial or hand swelling, which deserves a same-day call.
Weeks of pregnancy don't map cleanly to calendar months, but the common division puts week 23 falls in month 2 of pregnancy (weeks 5–8). Week 23 is part of the second trimester, which runs from week 14 to week 27. Gestationally, week 23 means you are 22 weeks and 0 to 6 days pregnant.
At week 23 the baby averages 11.4 in long and weighs about 1.1 lb, roughly the size of a large mango. Sizes come from fetal growth charts (crown-to-heel length from week 20), and normal variation week to week is wide; your ultrasound measurements always outrank a chart.