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Conceived in January: when is the baby due?

A baby conceived in January is due between 24 September and 24 October.

That is 38 weeks (266 days) after conception: a pregnancy is counted as 40 weeks from the first day of the last period, about two weeks before conception.

Calculate from
days

Usually 28 days. Count from the first day of one period to the first day of the next.

Calculated on your device. Nothing is sent.

Estimated due date

Enter a date to see your estimated due date.

Not medical advice. Every pregnancy is different: ask your midwife or doctor about yours.

Due date for each day in January

Due date for a conception on each day in January
ConceptionDue date
1 January24 September
2 January25 September
3 January26 September
4 January27 September
5 January28 September
6 January29 September
7 January30 September
8 January1 October
9 January2 October
10 January3 October
11 January4 October
12 January5 October
13 January6 October
14 January7 October
15 January8 October
16 January9 October
17 January10 October
18 January11 October
19 January12 October
20 January13 October
21 January14 October
22 January15 October
23 January16 October
24 January17 October
25 January18 October
26 January19 October
27 January20 October
28 January21 October
29 January22 October
30 January23 October
31 January24 October

In a leap year, the date moves by one day when 29 February falls between conception and the due date.

Frequently asked questions

If we conceived in January, when is the baby due?

A baby conceived in January is due between 24 September and 24 October. The table on this page gives the due date for each day of conception, and the calculator works it out from your own date.

Why is the due date 40 weeks if the baby was conceived 38 weeks before?

Pregnancy is counted from the first day of the last period, about two weeks before ovulation and conception. So the 40 weeks include two weeks before the baby was conceived.

Will the baby come on the due date?

Probably not exactly. Only about 4% of babies are born on their due date, and most arrive in the two weeks before or after it. An early scan gives the most reliable date.