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Conceived in May: when is the baby due?

A baby conceived in May is due between 22 January and 21 February of the following year.

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 May

Due date for a conception on each day in May
ConceptionDue date
1 May22 January
2 May23 January
3 May24 January
4 May25 January
5 May26 January
6 May27 January
7 May28 January
8 May29 January
9 May30 January
10 May31 January
11 May1 February
12 May2 February
13 May3 February
14 May4 February
15 May5 February
16 May6 February
17 May7 February
18 May8 February
19 May9 February
20 May10 February
21 May11 February
22 May12 February
23 May13 February
24 May14 February
25 May15 February
26 May16 February
27 May17 February
28 May18 February
29 May19 February
30 May20 February
31 May21 February

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 May, when is the baby due?

A baby conceived in May is due between 22 January and 21 February of the following year. 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.