30 Weeks Pregnant — Baby Is the Size of a Cabbage
At 30 weeks you are 210 days into the 40-week count, with 70 days to go and 75% of the pregnancy behind you. Baby is about the size of a cabbage and weighs about 23 g. This page fixes week 30 in place: what is developing, which appointments are still ahead, and how the week maps onto months.
75% 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
Hair is growing and vision is sharpening. Baby's eyes can now track a light shown through your belly.
Measured in months, week 30 sits in month 7: The third trimester opens with glucose screening, growth checks and a growing list of appointments.
Appointments still ahead
| Window | Appointment | What it checks |
|---|---|---|
| 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 30
| Week | Size | Weight |
|---|---|---|
| 29 | a butternut squash | about 21.5 g |
| 30 | a cabbage | about 23 g |
| 31 | a coconut | about 24.5 g |
Frequently asked
What does 30 weeks pregnant mean in days and months?
30 weeks is 210 days since the first day of your last period, which is about 7 months pregnant on the four-week-per-month convention. 70 days remain in the 40-week count from here — that is 75% of the way through.
How big is a baby at 30 weeks?
Around the size of a cabbage, at about 23 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 30?
The 3rd 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 30?
Next up: 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.