27 Weeks Pregnant — Baby Is the Size of a Cauliflower
At 27 weeks you are 189 days into the 40-week count, with 91 days to go and 68% of the pregnancy behind you. Baby is about the size of a cauliflower and weighs about 18.5 g. This page fixes week 27 in place: what is developing, which appointments are still ahead, and how the week maps onto months.
68% 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
Baby can sleep, dream and cry — all practiced in the womb. Brain activity is building rapidly.
Measured in months, week 27 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 |
|---|---|---|
| 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 27
| Week | Size | Weight |
|---|---|---|
| 26 | a head of lettuce | about 17.1 g |
| 27 | a cauliflower | about 18.5 g |
| 28 | an eggplant | about 20 g |
Frequently asked
What does 27 weeks pregnant mean in days and months?
27 weeks is 189 days since the first day of your last period, which is about 7 months pregnant on the four-week-per-month convention. 91 days remain in the 40-week count from here — that is 68% of the way through.
How big is a baby at 27 weeks?
Around the size of a cauliflower, at about 18.5 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 27?
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 27?
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.