The short answer
39 weeks = 9 months
At 39 weeks pregnant, you are about 9 months pregnant — in month 9 of your pregnancy and in your third trimester.
Not sure of your week? Use the pregnancy week calculator to find it from your last period, due date or conception date.
Full term! From 39 weeks 0 days the baby is considered fully ready for life outside the womb.
About the size of a mini watermelon
size comparison
50.7 cm
crown to heel (20.0 in)
3.3 kg
average weight (7.3 lb)
The chest is more prominent now, and the fat stores that will keep the newborn warm are largely in place. The brain is about 30 percent bigger than it was a month ago and continues growing quickly after birth. Skin has taken on a whitish or pinkish tone as the vessels beneath it are covered by fat.
Sizes and weights are averages — healthy babies vary widely, and your scan measurements are what count.
Signs that labor could be near include a change in discharge, loose stools, a low ache in the back and contractions that grow closer together. Many people describe restlessness or wanting to be left alone. Cramping and pelvic pressure can be constant companions.
Common symptoms this week
7
days to go
1
weeks to go
273
days so far
At 39 weeks 0 days you are 273 days into a 280-day pregnancy, which leaves 7 days — 1 week — until 40 weeks. That number drops by one for every day you move through this week. Remember the due date is an estimate: only about 1 in 20 babies is born on it, and most arrive within two weeks on either side.
Next milestone: 7 days until your due date (40 weeks 0 days).
From 39 weeks 0 days a pregnancy is classed as full term — the point at which the lungs and brain are considered fully ready, and the reason elective deliveries are generally not scheduled before it.
The term labels are set by exact week and day, not by month: early term is 37 weeks 0 days to 38 weeks 6 days, full term is 39 weeks 0 days to 40 weeks 6 days, late term is 41 weeks 0 days to 41 weeks 6 days, and post-term is 42 weeks 0 days onward. All four fall inside "9 months pregnant", which is exactly why your care team never uses months for this.
A calendar month averages about 4.3 weeks — not 4 — so you can't just divide your week number by four. Instead, months of pregnancy are counted as uneven buckets of 4 to 5 weeks, arranged so the full 40 weeks fits into 9 calendar months. Week 39 falls in month 9, in the third trimester.
Your care team will always use weeks and days rather than months, because screening windows and term definitions are set by exact week — months are just the everyday shorthand. For the full conversion, see the weeks to months chart, or go the other way with the months-to-weeks guide.
Your notes will show a week and a day — 39+3 or 39w3d, for example. Pick the exact day you are on for its own day count, countdown and month answer.
| Week + day | Shorthand | Days pregnant | Days to go |
|---|---|---|---|
| 39 weeks 0 days (this page) | 39+0 | 273 | 7 |
| 39 weeks 1 day | 39+1 | 274 | 6 |
| 39 weeks 2 days | 39+2 | 275 | 5 |
| 39 weeks 3 days | 39+3 | 276 | 4 |
| 39 weeks 4 days | 39+4 | 277 | 3 |
| 39 weeks 5 days | 39+5 | 278 | 2 |
| 39 weeks 6 days | 39+6 | 279 | 1 |
At 39 weeks pregnant, you are about 9 months pregnant — in month 9 of your pregnancy and in your third trimester. Months of pregnancy are counted as uneven 4–5 week buckets so that the full 40 weeks fits into 9 calendar months.
39 weeks is in the third trimester, which runs from 28 weeks 0 days until birth. You are now considered full term from 39 weeks 0 days.
About 1 week until the 40-week mark — though only about 1 in 20 babies arrives exactly on the due date. Most are born within two weeks on either side of it.
At 39 weeks 0 days you are 273 days into a 280-day pregnancy, so there are 7 days left until the 40-week mark — that's 1 week. The count drops by one for each day you move through week 39.
39 weeks is 273 days, counted from the first day of your last menstrual period (39 × 7 = 273). Add the days into your current week for the exact figure — for example 39 weeks 3 days is 276 days.