Due or born in October: when was the baby conceived?
A baby due in October was most likely conceived between 8 January and 7 February.
For a baby born in October at full term, from 37 to 42 weeks, conception was most likely between 25 December and 28 February.
Most likely conception date
Enter a date to see when conception most likely happened.
Not medical advice. Every pregnancy is different: ask your midwife or doctor about yours.
Conception date for each day in October
| Due date or birthday | Conception, for a due date | Conception, for a birth at 37 to 42 weeks |
|---|---|---|
| 1 October | 8 January | 25 December to 29 January |
| 2 October | 9 January | 26 December to 30 January |
| 3 October | 10 January | 27 December to 31 January |
| 4 October | 11 January | 28 December to 1 February |
| 5 October | 12 January | 29 December to 2 February |
| 6 October | 13 January | 30 December to 3 February |
| 7 October | 14 January | 31 December to 4 February |
| 8 October | 15 January | 1 January to 5 February |
| 9 October | 16 January | 2 January to 6 February |
| 10 October | 17 January | 3 January to 7 February |
| 11 October | 18 January | 4 January to 8 February |
| 12 October | 19 January | 5 January to 9 February |
| 13 October | 20 January | 6 January to 10 February |
| 14 October | 21 January | 7 January to 11 February |
| 15 October | 22 January | 8 January to 12 February |
| 16 October | 23 January | 9 January to 13 February |
| 17 October | 24 January | 10 January to 14 February |
| 18 October | 25 January | 11 January to 15 February |
| 19 October | 26 January | 12 January to 16 February |
| 20 October | 27 January | 13 January to 17 February |
| 21 October | 28 January | 14 January to 18 February |
| 22 October | 29 January | 15 January to 19 February |
| 23 October | 30 January | 16 January to 20 February |
| 24 October | 31 January | 17 January to 21 February |
| 25 October | 1 February | 18 January to 22 February |
| 26 October | 2 February | 19 January to 23 February |
| 27 October | 3 February | 20 January to 24 February |
| 28 October | 4 February | 21 January to 25 February |
| 29 October | 5 February | 22 January to 26 February |
| 30 October | 6 February | 23 January to 27 February |
| 31 October | 7 February | 24 January to 28 February |
In a leap year, the date moves by one day when 29 February falls between conception and the due date or birth.
Frequently asked questions
If our baby is due in October, when did we conceive?
A baby due in October was most likely conceived between 8 January and 7 February. That is 38 weeks (266 days) before the due date. The table on this page gives the date for each due date in the month.
Born in October: when was the baby conceived?
For a baby born in October at full term, from 37 to 42 weeks, conception was most likely between 25 December and 28 February. For a birth at exactly 40 weeks, it is the same date as for a due date that day.
Can a conception date settle a paternity question?
No. This is the textbook estimate. It cannot know your cycle, when you actually ovulated or how the pregnancy was dated, and it is not precise enough to tell apart two dates a few days apart.