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Conceived in December 2026: when is the baby due?

If you conceived in December 2026, your baby is due between August 24, 2027 and September 23, 2027. Find your exact day in the table.

Due date: August 24, 2027. Most babies arrive between Aug 3 and Sep 7.

Open the full calculator for this date

Due date for every day of December 2026

ConceivedDue dateMost babies arrive
Dec 1Aug 24, 2027Aug 3 – Sep 7
Dec 2Aug 25, 2027Aug 4 – Sep 8
Dec 3Aug 26, 2027Aug 5 – Sep 9
Dec 4Aug 27, 2027Aug 6 – Sep 10
Dec 5Aug 28, 2027Aug 7 – Sep 11
Dec 6Aug 29, 2027Aug 8 – Sep 12
Dec 7Aug 30, 2027Aug 9 – Sep 13
Dec 8Aug 31, 2027Aug 10 – Sep 14
Dec 9Sep 1, 2027Aug 11 – Sep 15
Dec 10Sep 2, 2027Aug 12 – Sep 16
Dec 11Sep 3, 2027Aug 13 – Sep 17
Dec 12Sep 4, 2027Aug 14 – Sep 18
Dec 13Sep 5, 2027Aug 15 – Sep 19
Dec 14Sep 6, 2027Aug 16 – Sep 20
Dec 15Sep 7, 2027Aug 17 – Sep 21
Dec 16Sep 8, 2027Aug 18 – Sep 22
Dec 17Sep 9, 2027Aug 19 – Sep 23
Dec 18Sep 10, 2027Aug 20 – Sep 24
Dec 19Sep 11, 2027Aug 21 – Sep 25
Dec 20Sep 12, 2027Aug 22 – Sep 26
Dec 21Sep 13, 2027Aug 23 – Sep 27
Dec 22Sep 14, 2027Aug 24 – Sep 28
Dec 23Sep 15, 2027Aug 25 – Sep 29
Dec 24Sep 16, 2027Aug 26 – Sep 30
Dec 25Sep 17, 2027Aug 27 – Oct 1
Dec 26Sep 18, 2027Aug 28 – Oct 2
Dec 27Sep 19, 2027Aug 29 – Oct 3
Dec 28Sep 20, 2027Aug 30 – Oct 4
Dec 29Sep 21, 2027Aug 31 – Oct 5
Dec 30Sep 22, 2027Sep 1 – Oct 6
Dec 31Sep 23, 2027Sep 2 – Oct 7

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: Feb 17 – Mar 9, 2027
  • Anatomy scan window: Apr 7 – May 11, 2027
  • Third trimester begins: Jun 16, 2027
  • Full term: Sep 1 – 14, 2027

About December 2026

Babies conceived in December 2026 are mostly born in autumn in the northern half of the world, and in spring in the southern half.

Questions about a December 2026 conception

If I conceived in December 2026, when is my baby due?

Your due date is between August 24, 2027 and September 23, 2027, depending on the day you conceived. Find your day in the table above. A due date is about 38 weeks (266 days) after conception (ACOG).

Why is the due date about 38 weeks after conception?

Pregnancy is counted from the first day of the last period, about 2 weeks before conception. So a conception on December 16, 2026 gives a due date of September 8, 2027: 40 weeks of pregnancy, but about 38 weeks after conception (ACOG).

Will my baby be born on September 8, 2027?

Probably not on that exact day. For a conception on December 16, 2026, most babies arrive between August 18, 2027 and September 22, 2027, at 37 to 42 weeks (CDC). Your midwife or doctor will confirm your dates.

Other months

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