Probability of delivery resulting from spontaneous labor after 35 weeks

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The most important question I was trying to answer with the survey was this: "When is a baby most likely to spontaneously show up?" The graph above shows the percentages, based on 11105 responses. 8457 of the deliveries were as a result of labor occuring spontaneously. The chart only shows these deliveries, which is why the percentages do not add up to 100%, because only 76% of participants had spontaneous (non-induced) labor.

The statistics right now are as follows:

Data Table

The percentages are based on ALL births (including inductions)
DayWeekBirths Running TotalPercentRunning Total %
24535W,0D14140.1 % 0.1 %
24635W,1D17310.2 % 0.3 %
24735W,2D12430.1 % 0.4 %
24835W,3D22650.2 % 0.6 %
24935W,4D19840.2 % 0.8 %
25035W,5D211050.2 % 0.9 %
25135W,6D181230.2 % 1.1 %
25236W,0D321550.3 % 1.4 %
25336W,1D251800.2 % 1.6 %
25436W,2D352150.3 % 1.9 %
25536W,3D372520.3 % 2.3 %
25636W,4D322840.3 % 2.6 %
25736W,5D353190.3 % 2.9 %
25836W,6D403590.4 % 3.2 %
25937W,0D624210.6 % 3.8 %
26037W,1D594800.5 % 4.3 %
26137W,2D625420.6 % 4.9 %
26237W,3D786200.7 % 5.6 %
26337W,4D877070.8 % 6.4 %
26437W,5D797860.7 % 7.1 %
26537W,6D1189041.1 % 8.1 %
26638W,0D13310371.2 % 9.3 %
26738W,1D12011571.1 % 10.4 %
26838W,2D12212791.1 % 11.5 %
26938W,3D16314421.5 % 13 %
27038W,4D20416461.8 % 14.8 %
27138W,5D17518211.6 % 16.4 %
27238W,6D22620472 % 18.4 %
27339W,0D26723142.4 % 20.8 %
27439W,1D23425482.1 % 22.9 %
27539W,2D26228102.4 % 25.3 %
27639W,3D31931292.9 % 28.2 %
27739W,4D34834773.1 % 31.3 %
27839W,5D33938163.1 % 34.4 %
27939W,6D40442203.6 % 38 %
28040W,0D48347034.3 % 42.4 %
28140W,1D44351464 % 46.3 %
28240W,2D37555213.4 % 49.7 %
28340W,3D36158823.3 % 53 %
28440W,4D32962113 % 55.9 %
28540W,5D34565563.1 % 59 %
28640W,6D35169073.2 % 62.2 %
28741W,0D35072573.2 % 65.3 %
28841W,1D25675132.3 % 67.7 %
28941W,2D20677191.9 % 69.5 %
29041W,3D20479231.8 % 71.3 %
29141W,4D14480671.3 % 72.6 %
29241W,5D11281791 % 73.7 %
29341W,6D9182700.8 % 74.5 %
29442W,0D7183410.6 % 75.1 %
29542W,1D2783680.2 % 75.4 %
29642W,2D2683940.2 % 75.6 %
29742W,3D2284160.2 % 75.8 %
29842W,4D1284280.1 % 75.9 %
29942W,5D1084380.1 % 76 %
30042W,6D884460.1 % 76.1 %
30143W,0D1184570.1 % 76.2 %

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?
Birth Stories
Survey input dates

More Resources

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EDD Icon Generator
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Recent Comments

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you are invited to join our pregnancy forum. We are dedicated to answering complicated questions as logically as we possibly can.

bringing children up naturist

Sat Sep 24 1:18 AM by filmmakingally in Pregnancy & Parenting

It's about teaching children to make love so that they do it themselves. Love has no age or genetic requirement. It's healthy for young siblings to make love, and it's unhealthy if they don't. Sexual repression of children fucks them up as adults. Because the parents are secretive about it, children get the idea that it's bad, which starts the process of sexual repression.

Gross. Yuck. Eww. I've run out of ways to express how disgusted I am with what you've said here. Ewwwwwww!!!!!!!

No, siblings should not make love. It is in our genetic interest that we don't do this. Ever. This is a cultural universal.


learning to use a toilet

Sun Sep 11 2:33 PM by Angelica in Pregnancy & Parenting

My statement was meant to indicate that I'm not finished with my thoughts on this topic, rather than to create drama.

I believe parents in this world universally make a big mistake when it comes time to start thinking about their children using the toilet. Kids feel forced to do it, and this breeds resentment and damages their self-esteem. Having the father (the mother is needed in the battle against the patriarchy) stay home with the children and homeschool them while they haven't yet decided to train themselves is the way to avoid humiliation by their more-repressed peers.

I would also like to point out that limiting elimination to the toilet at any age creates situations where the person's health is compromised due to the lack of availability of a bathroom. In these situations, I strongly advise parents to let their children wear diapers no matter their age. Retention can lead to kidney stones, intestinal damage, urinary tract infections and harmful bacteria and toxins in the bloodstream.


How to Announce Baby #4?

Thu Sep 8 5:00 AM by Carol Palmer in Pregnancy & Parenting

FB pic is the best idea. All your friends and relatives can definitely post in comments or expressions . Consider yourself lucky to have many children. They are a blessing from God


How NOT to help parents with a newborn

Fri Jul 22 6:11 PM by missmay in Pregnancy & Parenting

oh, lord, i am so tired of people telling me to "enjoy it!" regarding my newborn. and asking me if she is a "good baby." how could a baby be bad? and how does it make me enjoy her more to be reminded to do so? i imagine that if i was depressed and had a colicky baby these questions would be even more obnoxious.


Kids are full of LIES

Sun May 22 2:29 PM by rowan in Pregnancy & Parenting

Don't be silly monk, everyone knows a good conglomerate goes better with milk


Don't give your kids antidepressants.

Thu Sep 15 9:13 PM by Nachos in Pregnancy & Parenting

Mental health issues will never start to hurt, therefore no preemptive treatment is needed.

Mental health issues hurt, take it from me. There are many psychosomatic disorders out there which affect your body even though the real problem is in your mind. But to get better, you HAVE to treat both. Pre-emptive treatment also can stop some disorders from becoming too bad. And yes, sometimes drugs can be very very helpful.

I don't think you know what you're talking about and all this "I know because of divine intuition" bullshit is starting to piss me off. if you ask others for sources, be kind enough to provide some yourself.

If this thread continues to be shit-slinging, I will lock it.


Middle grade / Beginning Chapter Books

Fri Sep 9 8:01 PM by melsbells in Pregnancy & Parenting

I think a big driver in getting them to read is to find stories that they like.
Definitely this. I once tutored a kid who had been held back twice in elementary school and was still a couple grade levels behind on reading skills. He was given a book from the Captain Underpants series because it was supposed to be at his reading level but he thought it was utterly stupid. I don't think we ever found books that both matched his reading level and maturity level, but once we started reading books better suited to his interests, it didn't matter that they were more difficult.

One of my cousins kids read the Warriors series and was really into it. She was bulllied in school, but I don't think it was instigated by her reading choices.

I don't know any recent books for this age group but I've heard great things about the Adventure Time comics.


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Mon Sep 5 8:59 PM by melsbells in Pregnancy & Parenting

^That's funny because the bjorn carrier is the one I was given that I didn't like. I think that just re-emphasizes that the same thing isn't going to work the same for everyone.


Denial Trends?

Thu Jul 21 7:24 PM by SameMom in Pregnancy & Parenting

Sorry, if I was not able to mention other details. Actually, I have a (US) medicare insurance. And I am particularly referring to this denial management software which help clients with their claims. Thanks for your reply. :)


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Sun May 15 9:19 PM by melsbells in Pregnancy & Parenting

For the first two birthdays, we tried to make some special food and splurge on interesting fruit. If I lived closer to friends, I would want to throw a get-together as an excuse to see my friends, celebrate our survival of another year. I don't think my kid would actually be into that though. They are turning out to be quite introverted and shy.


Sleep Training for Parents and Infants

Wed Sep 14 4:04 AM by monk in Pregnancy & Parenting

This video is by my favorite health info series. There's always links to sources and the host is doctor very respected who writes medical articles for the NYTimes.
Get some sleep mom & dad.

jyPYf9jIuRE


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Mon Sep 5 5:20 PM by rowan in Pregnancy & Parenting

^Hm that reminds me of a thing I read about pushing reading (and by extension other things) in this country too. I'll see if I can't dredge it up.


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Fri Jul 1 5:17 AM by cwbyrvr in Pregnancy & Parenting

I do find it very interesting to find that IKEA is recalling furniture because people don't secure it to walls... I was given anchors with all of the stuff I've bought from there. Though maybe that's only a somewhat recent thing? It was over a half a year ago that I bought stuff from there, though.

And I didn't use the anchors... I guess I am about to be an aunt and it might be a good idea to get that stuff secured in case I ever end up watching my niece here. Hadn't really worried about it prior because there was literally never going to be a time I'd have kids running around this place. The likelihood of my niece ever being here is pretty damn low too, but I wouldn't say 0%.


Pregnancy Guidebooks for Cool Moms (humor)

Wed May 11 3:39 PM by rowan in Pregnancy & Parenting

One of my friends is part of this magazine. She didn't write this one but it's pretty hilarious.

http://theoffingmag.com/wits-end/pregna ... cool-moms/

Anyone want to come up with our own "Guidebook" titles?

spoiler:
the one about inducing labor by setting your hair on fire is my favorite