The short answer
33 weeks = 8 months
At 33 weeks pregnant, you are about 8 months pregnant — in month 8 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.
Bones are hardening (except the skull, which stays flexible for birth), and the immune system is taking on antibodies from you.
About the size of a pineapple
size comparison
43.7 cm
crown to heel (17.2 in)
1.9 kg
average weight (4.2 lb)
The immune system is developing rapidly, and antibodies pass from you across the placenta. Brain development is in a rapid growth phase, and the fetus can now differentiate between day and night. Amniotic fluid volume is at its peak, and the fetus’s pupils can dilate and constrict.
Sizes and weights are averages — healthy babies vary widely, and your scan measurements are what count.
Sleep disruption from bathroom trips, discomfort and an active baby is common. Numbness or tingling in the fingers can indicate carpal tunnel from fluid retention. Some people feel more clumsy or off-balance.
Common symptoms this week
49
days to go
7
weeks to go
231
days so far
At 33 weeks 0 days you are 231 days into a 280-day pregnancy, which leaves 49 days — 7 weeks — 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: 28 days until early term (37 weeks 0 days).
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 33 falls in month 8, 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 — 33+3 or 33w3d, 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 |
|---|---|---|---|
| 33 weeks 0 days (this page) | 33+0 | 231 | 49 |
| 33 weeks 1 day | 33+1 | 232 | 48 |
| 33 weeks 2 days | 33+2 | 233 | 47 |
| 33 weeks 3 days | 33+3 | 234 | 46 |
| 33 weeks 4 days | 33+4 | 235 | 45 |
| 33 weeks 5 days | 33+5 | 236 | 44 |
| 33 weeks 6 days | 33+6 | 237 | 43 |
At 33 weeks pregnant, you are about 8 months pregnant — in month 8 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.
33 weeks is in the third trimester, which runs from 28 weeks 0 days until birth. Full term begins at 39 weeks 0 days.
About 7 weeks 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 33 weeks 0 days you are 231 days into a 280-day pregnancy, so there are 49 days left until the 40-week mark — that's 7 weeks. The count drops by one for each day you move through week 33.
33 weeks is 231 days, counted from the first day of your last menstrual period (33 × 7 = 231). Add the days into your current week for the exact figure — for example 33 weeks 3 days is 234 days.