Subsequent pregnancy date search

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This form lets you search for mothers who had babies on a certain day, to see when their next one was born. This page throws out all inductions, including for the previous births (ie, to be included in results for "mothers who had first babies at 39W 5D", the birth had to be spontaneous).
Show results for the baby
where the first was born on at weeks days
plus or minus days

Cumulative Distribution

This graph shows the percentage of births that'd occured on or before a given day, like a running total.

Totals and Averages

# of survey participantsAverage Arrival
All 2nd babies240839W,5D
2nd babies after 1st was born between days 278-2825339W,6D

Data table: Distribution of 2nd babies after 1st was born between days 278-282

This table only shows spontaneous births.
DayAll 2nd babies2nd babies after 1st was born between days 278-282
#%#%
35W,0D 6 0% 0 0%
35W,1D 1 0% 0 0%
35W,2D 7 0% 0 0%
35W,3D 3 0% 0 0%
35W,4D 4 0% 0 0%
35W,5D 6 0% 0 0%
35W,6D 3 0% 0 0%
36W,0D 10 0% 0 0%
36W,1D 4 0% 0 0%
36W,2D 14 1% 0 0%
36W,3D 8 0% 0 0%
36W,4D 11 0% 0 0%
36W,5D 15 1% 0 0%
36W,6D 12 0% 0 0%
37W,0D 21 1% 2 4%
37W,1D 17 1% 0 0%
37W,2D 18 1% 0 0%
37W,3D 15 1% 0 0%
37W,4D 24 1% 2 4%
37W,5D 30 1% 0 0%
37W,6D 31 1% 0 0%
38W,0D 42 2% 1 2%
38W,1D 31 1% 1 2%
38W,2D 33 1% 0 0%
38W,3D 55 2% 0 0%
38W,4D 62 3% 0 0%
38W,5D 55 2% 1 2%
38W,6D 73 3% 3 6%
39W,0D 82 3% 0 0%
39W,1D 55 2% 0 0%
39W,2D 70 3% 2 4%
39W,3D 107 4% 2 4%
39W,4D 100 4% 4 8%
39W,5D 92 4% 3 6%
39W,6D 105 4% 5 9%
40W,0D 134 6% 0 0%
40W,1D 123 5% 6 11%
40W,2D 123 5% 2 4%
40W,3D 100 4% 3 6%
40W,4D 81 3% 1 2%
40W,5D 81 3% 3 6%
40W,6D 108 4% 3 6%
41W,0D 103 4% 3 6%
41W,1D 59 2% 1 2%
41W,2D 67 3% 2 4%
41W,3D 68 3% 0 0%
41W,4D 19 1% 0 0%
41W,5D 40 2% 2 4%
41W,6D 20 1% 0 0%
42W,0D 22 1% 0 0%
42W,1D 15 1% 1 2%
42W,2D 8 0% 0 0%
42W,3D 7 0% 0 0%
42W,4D 3 0% 0 0%
42W,5D 1 0% 0 0%
42W,6D 1 0% 0 0%
43W,0D 3 0% 0%

Data table: 2nd babies after 1st was born between days 278-282

This table includes all mothers who spontaneously had their 1st baby within the specified dates.
1st baby 2nd baby 2nd baby induced?
39W,5D 37W,4D
39W,5D 37W,6D Yes (this result was excluded from charts and average table)
39W,5D 38W,6D
39W,5D 39W,2D
39W,5D 39W,4D
39W,5D 39W,6D
39W,5D 39W,6D
39W,5D 40W,0D
39W,5D 40W,0D
39W,5D 40W,0D
39W,5D 40W,0D
39W,5D 40W,1D
39W,5D 40W,3D
39W,5D 40W,6D
39W,6D 38W,0D
39W,6D 38W,5D
39W,6D 39W,3D Yes (this result was excluded from charts and average table)
39W,6D 39W,3D
39W,6D 39W,4D
39W,6D 39W,6D
39W,6D 40W,0D
39W,6D 40W,0D
39W,6D 40W,1D
39W,6D 40W,1D
39W,6D 40W,1D
39W,6D 40W,3D
39W,6D 40W,5D
39W,6D 40W,5D
39W,6D 41W,0D
39W,6D 41W,2D
39W,6D 41W,5D
40W,0D 37W,0D
40W,0D 38W,6D
40W,0D 39W,1D Yes (this result was excluded from charts and average table)
40W,0D 39W,4D
40W,0D 39W,5D
40W,0D 39W,6D
40W,0D 40W,0D
40W,0D 40W,0D
40W,0D 40W,0D
40W,0D 40W,0D
40W,0D 40W,0D
40W,0D 40W,2D
40W,0D 40W,4D
40W,0D 40W,5D
40W,0D 40W,6D
40W,0D 41W,1D
40W,0D 41W,4D Yes (this result was excluded from charts and average table)
40W,1D 37W,0D
40W,1D 37W,4D
40W,1D 38W,0D Yes (this result was excluded from charts and average table)
40W,1D 38W,1D
40W,1D 38W,6D
40W,1D 39W,2D
40W,1D 39W,3D Yes (this result was excluded from charts and average table)
40W,1D 39W,3D Yes (this result was excluded from charts and average table)
40W,1D 39W,4D
40W,1D 39W,5D
40W,1D 39W,6D Yes (this result was excluded from charts and average table)
40W,1D 40W,0D
40W,1D 40W,0D
40W,1D 40W,0D Yes (this result was excluded from charts and average table)
40W,1D 40W,1D
40W,1D 40W,1D
40W,1D 40W,6D
40W,1D 41W,0D
40W,1D 41W,2D Yes (this result was excluded from charts and average table)
40W,1D 41W,4D Yes (this result was excluded from charts and average table)
40W,2D 39W,3D
40W,2D 39W,5D
40W,2D 39W,6D
40W,2D 40W,2D
40W,2D 40W,3D
40W,2D 41W,0D
40W,2D 41W,2D
40W,2D 41W,5D
40W,2D 42W,1D

Due Date Survey Data

Due date statistics: A study on the length of pregnancy
Probability of delivery resulting from spontaneous labor after 35 weeks
Probability of delivery within x days of a given date
Length of pregnancy by week
Spontaneous labor and due date determination
Length of pregnancy, comparing subsequent births for individual moms
Length of pregnancy for first time vs. second & third time moms
Length of pregnancy, type of delivery
Gestation vs. Birthweight
Probablity of Induction after a given day
Average day of spontaneous labor vs. age of mother at time of birth
Are more babies born during a full moon?
What's the most common day of the week for babies to be born?
I'm still pregnant at 40W. What's it mean?
Do winter babies arrive later?
What if I know my conception date?
Are boys or girls born later?
Subsequent pregnancy date search
How do inductions bias the due date statistics?
Download the data
Birth Stories
Survey input dates

More Resources

Pregnancy Day-by-Day
Fast pregnancy calendar
Baby age calendar
EDD Icon Generator
Jo's Birth Story
Weeks vs. Months Explained
Charts generated by flot
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