Due in December 2026: when did I conceive?
If your baby is due in December 2026, you most likely conceived between March 10, 2026 and April 9, 2026. Find your due date in the table.
Conception date for every due date in December 2026
| Due date | Conceived | Last period started |
|---|---|---|
| Dec 1 | Mar 10, 2026 | Feb 24, 2026 |
| Dec 2 | Mar 11, 2026 | Feb 25, 2026 |
| Dec 3 | Mar 12, 2026 | Feb 26, 2026 |
| Dec 4 | Mar 13, 2026 | Feb 27, 2026 |
| Dec 5 | Mar 14, 2026 | Feb 28, 2026 |
| Dec 6 | Mar 15, 2026 | Mar 1, 2026 |
| Dec 7 | Mar 16, 2026 | Mar 2, 2026 |
| Dec 8 | Mar 17, 2026 | Mar 3, 2026 |
| Dec 9 | Mar 18, 2026 | Mar 4, 2026 |
| Dec 10 | Mar 19, 2026 | Mar 5, 2026 |
| Dec 11 | Mar 20, 2026 | Mar 6, 2026 |
| Dec 12 | Mar 21, 2026 | Mar 7, 2026 |
| Dec 13 | Mar 22, 2026 | Mar 8, 2026 |
| Dec 14 | Mar 23, 2026 | Mar 9, 2026 |
| Dec 15 | Mar 24, 2026 | Mar 10, 2026 |
| Dec 16 | Mar 25, 2026 | Mar 11, 2026 |
| Dec 17 | Mar 26, 2026 | Mar 12, 2026 |
| Dec 18 | Mar 27, 2026 | Mar 13, 2026 |
| Dec 19 | Mar 28, 2026 | Mar 14, 2026 |
| Dec 20 | Mar 29, 2026 | Mar 15, 2026 |
| Dec 21 | Mar 30, 2026 | Mar 16, 2026 |
| Dec 22 | Mar 31, 2026 | Mar 17, 2026 |
| Dec 23 | Apr 1, 2026 | Mar 18, 2026 |
| Dec 24 | Apr 2, 2026 | Mar 19, 2026 |
| Dec 25 | Apr 3, 2026 | Mar 20, 2026 |
| Dec 26 | Apr 4, 2026 | Mar 21, 2026 |
| Dec 27 | Apr 5, 2026 | Mar 22, 2026 |
| Dec 28 | Apr 6, 2026 | Mar 23, 2026 |
| Dec 29 | Apr 7, 2026 | Mar 24, 2026 |
| Dec 30 | Apr 8, 2026 | Mar 25, 2026 |
| Dec 31 | Apr 9, 2026 | Mar 26, 2026 |
These are estimates: conception usually happens around ovulation, and babies arrive at different times. An early ultrasound gives the most accurate dates.
Key dates for a pregnancy from the middle of December 2026
- Nuchal translucency (NT) scan window: May 27 – Jun 16, 2026
- Anatomy scan window: Jul 15 – Aug 18, 2026
- Third trimester begins: Sep 23, 2026
- Full term: Dec 9 – 22, 2026
About December 2026
Babies due in December 2026 were mostly conceived in spring in the northern half of the world (autumn in the southern half).
Questions about a December 2026 due date
If I’m due in December 2026, when did I conceive?
Most likely between March 10, 2026 and April 9, 2026, about 38 weeks (266 days) before each due date. Find your due date in the table above to see your day (ACOG).
When did my last period start if I’m due in December 2026?
About 280 days (40 weeks) before the due date: between February 24, 2026 and March 26, 2026. For example, a due date of December 16, 2026 means the last period started around March 11, 2026 (ACOG).
If I’m due on December 16, 2026, did I conceive on March 25, 2026?
Not always on that exact day. Conception usually happens around ovulation, and ovulation can come earlier or later in a cycle. An early ultrasound gives the most accurate dates, so ask your midwife or doctor (ACOG).