Due in December 2026
If your estimated due date falls between December 1, 2026 and December 31, 2026, these are the date ranges your pregnancy shares with everyone due that month. Each range runs from a December 1 due date to a December 31 due date.
| Milestone | Due Dec 1 | Due Dec 31 |
|---|---|---|
| First day of last periodOr the equivalent date for a cycle other than 28 days. | Feb 24, 2026 | Mar 26, 2026 |
| Estimated conceptionAround 2 weeks 0 days. | Mar 10, 2026 | Apr 9, 2026 |
| Most accurate ultrasound dating ends13 weeks 6 days. | Jun 1, 2026 | Jul 1, 2026 |
| Second trimester begins14 weeks 0 days. | Jun 2, 2026 | Jul 2, 2026 |
| Third trimester begins28 weeks 0 days. | Sep 8, 2026 | Oct 8, 2026 |
| Early term begins37 weeks 0 days. | Nov 10, 2026 | Dec 10, 2026 |
| Full term begins39 weeks 0 days. | Nov 24, 2026 | Dec 24, 2026 |
| Late term ends41 weeks 6 days. | Dec 14, 2026 | Jan 13, 2027 |
Dates follow ACOG’s trimester and term definitions.1,2 For your exact dates, use the calculator below.
How far along you’ll be, month by month
The range covers every December due date, from the start to the end of each month.
- February 20260 weeks1st trimester
- March 20260–5 weeks1st trimester
- April 20260–9 weeks1st trimester
- May 20265–13 weeks1st trimester
- June 20269–18 weeks1st to 2nd trimester
- July 202613–22 weeks1st to 2nd trimester
- August 202618–26 weeks2nd trimester
- September 202622–31 weeks2nd to 3rd trimester
- October 202627–35 weeks2nd to 3rd trimester
- November 202631–39 weeks3rd trimester
- December 202635–41 weeks3rd trimester
- January 202740–41 weeks3rd trimester
A December due date is a window, not a deadline
Full term starts at 39 weeks, so for a December 2026 due date it begins as early as November 24, 2026. Late term runs until 41 weeks 6 days, as late as January 13, 2027.2 In an Australian study of births after spontaneous labor, only about 5% arrived on the estimated due date, and about two-thirds within a week of it.3 So a December baby may well arrive in November or January.
Your due date may also move once, after an early ultrasound.4 Read how accurate due dates are.
Find your exact dates
Enter the due date your care team gave you, or choose another method.
Sources
- How Your Fetus Grows During PregnancyAmerican College of Obstetricians and Gynecologists
- Committee Opinion No. 579: Definition of Term PregnancyAmerican College of Obstetricians and Gynecologists, 2013
- Predicting date of birth and examining the best time to date a pregnancyInternational Journal of Gynecology & Obstetrics 123(2):105–109, 2013
- Committee Opinion No. 700: Methods for Estimating the Due DateAmerican College of Obstetricians and Gynecologists, with AIUM and SMFM, 2017
Links checked November 12, 2026. Citing a source does not mean it endorses this site.