24 Weeks Pregnant — Baby Is the Size of an Ear of corn
At 24 weeks you are 168 days into the 40-week count, with 112 days to go and 60% of the pregnancy behind you. Baby is about the size of an ear of corn and weighs about 14.3 g. This page fixes week 24 in place: what is developing, which appointments are still ahead, and how the week maps onto months.
60% of 280 days. The due date itself is a midpoint, not a deadline: full-term births spread across roughly weeks 37 to 42.
This week
The lungs are developing surfactant, the substance that will help them breathe air after birth. Viability threshold nears.
Measured in months, week 24 sits in month 6: Month six is the viability threshold, when a baby born early has a real chance with intensive care.
Appointments still ahead
| Window | Appointment | What it checks |
|---|---|---|
| 28–34 wks | Routine growth checks | Regular midwife visits, bump measurements and blood pressure. |
| 34–36 wks | Group B strep swab | A simple swab that protects the baby during delivery. |
| 37–40 wks | Weekly checkups | Position checks, growth checks and the birth plan in earnest. |
Around week 24
| Week | Size | Weight |
|---|---|---|
| 23 | a grapefruit | about 12.9 g |
| 24 | an ear of corn | about 14.3 g |
| 25 | a rutabaga | about 15.7 g |
Frequently asked
What does 24 weeks pregnant mean in days and months?
24 weeks is 168 days since the first day of your last period, which is about 6 months pregnant on the four-week-per-month convention. 112 days remain in the 40-week count from here — that is 60% of the way through.
How big is a baby at 24 weeks?
Around the size of an ear of corn, at about 14.3 g. These are population averages: a scan measurement that differs by a few days is normal and does not by itself mean anything is wrong.
Which trimester is week 24?
The 2nd trimester. The split used here is the same one the calculator applies: the first trimester covers days 1–90, the second 91–195, and the third from day 196 onward. Other sources draw the boundary a week either side, which is why week 13 and week 14 can both be described as "end of the first trimester".
What appointments happen after week 24?
Next up: Routine growth checks at 28–34 weeks, Group B strep swab at 34–36 weeks, Weekly checkups at 37–40 weeks. The full schedule is in the table above; exact timing varies by country and by your care team.