Informal "study"

[Devaskyla]

I was hoping that some of the mamas here would interested in doing something that might be an interesting experiment. I'm especially hoping some of the first time mamas would interested.

What I'd like is for you to make a post with all your "due dates" and see which ends up being the closest. The 3 main ones I was thinking of are: Naegle's method - this is the standard method (but seriously out of date and wrong, esp for first timers) of dating used by doctors and a lot of midwives. It's the one that the little wheels are based on

Ultrasound date - assuming you have an early ultrasound and are given a date based on it

Mittendorf-Williams - this is newer method based on current research, the studies showed it was a lot more accurate than Naegle's

Additional possibilities if you know ovulation date could be calculating Naegle & Mittendorf-Williams from ovulation instead of from LMP.

To calculate using Naegle's method for yourself (or you could use just about any online calculator) it is LMP + 9 months + 7 days.

To calculate using the Mittendorf-Williams method take the first day of your last period and subtract three months. Then you add fifteen days if this is your first baby and you are Caucasian. If you are not Caucasian or this is not your first baby, you will want to add on ten days.

The easiest way to calculate using ovulation is to just add or subtract the number of days your ovulation differed from the "standard" 14 days.

My due dates (based on LMP):

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan 14, 2012

Today's Parent & BabyCentre due date calculator Jan 12, 2012

Mittendorf-Williams:  Jan 17, 2012

Based on ovulation:

Naegle: Jan 16, 2012

Common due date calculators: Jan 14, 2012

Mittendorf-Williams: Jan 19, 2012

Hope some other people want to play along! :)

[indigoscot]

i'll play along!

My due dates (based on LMP):

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan 2, 2012

Today's Parent & BabyCentre due date calculator Dec 31, 2011

Mittendorf-Williams:  Jan 5, 2012

Based on ovulation (actually did ovulate on cd14):

Naegle: Jan 2, 2012

Common due date calculators: Dec 31, 2011

Mittendorf-Williams: Jan 5, 2012

we also had a couple of very early u/s at 6 weeks and 7 weeks.  both had the edd as Jan 1 2012.

g

[futuremamaheather]

When I initially calculated my due date, I used the Baby Center calculator, and counted back 14 days from ovulation and used that date in the LMP spot. That calculation brought me to a Dec. 27th due date. This is the date I have been going by, except that my midwife encouraged me to add 10-12 days to that in my mind because of being a first time mom and having longer cycles than the "average" 28 days. So that brings us to Jan. 6-8. I figure, this baby's going to pop out sometime between Christmas and Epiphany. Ish. 

My due dates (based on LMP): March 15, 2011

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Dec. 22, 2011

BabyCenter due date calculator: Dec. 20, 2011

Mittendorf-Williams: Dec. 30, 2011

Based on ovulation: April 5, 2011

Naegle: Jan 12, 2012

BabyCenter calculator, "date of conception" option: Jan 6, 2012

Mittendorf-Williams: Jan 20, 2012

[Conchobhar]

My due dates (based on LMP): 15 Apr. 2011

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan. 22, 2012

BabyCenter due date calculator:  Jan. 20, 2012

Mittendorf-Williams: Jan. 25, 2012

I'll guess on ovulation dates...  I get mittelschmertz, but since I was on Implanon for 18 months, things got screwed up and now I don't know if the pain signifies actual release or a couple days after.  With my first kid, we DTD 8 hours before I felt pain and got preggo. We tried that this time around and nothing happened.  DTD a couple days before and after and success.  So I really don't know when it actually happened.  But if anything, it's within days, so it shouldn't matter all too much.

My due dates (based on Ovulation):  30 Apr. 2011

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Feb. 6, 2012

BabyCenter due date calculator:  Jan. 21, 2012

Mittendorf-Williams: Jan. 26, 2012

BTW, if I did Mittendorf-Williams for my last kid's EDD, she would have been due March 15th.  She was born on the 13th, but I was given cervidil, so... Still much closer than the MW's date of March 9th.

Edited by Conchobhar - 6/30/11 at 10:22am

[bentlaj11]

My due dates (based on LMP): 4/3/11

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan.10, 2012

BabyCenter due date calculator: Jan. 8, 2012 (also the date my midwife gave me)

Mittendorf-Williams: Jan. 13, 2012

I can't remeber my LMP for DS, but I'm guessing that the M-W rule would have put me at a closer date than the date given to me by my provider.

[milomama]

Based on LMP (Apr 4)

Naegle: Jan 11, 2012

Baby Center: Jan 9

Mittendorf: Jan 14

Based on Ovulation (Apr 28)

Naegle: Jan 21

Baby Center (date I conceived): Jan 19

Mittendorf: Jan 24

That's crazy!  What a range!  I guess it comes down to this baby coming when it's good and ready to pop out!  I've been telling myself "mid-January" instead of a date, so I don't get a date too stuck in my head!

[ameliaanne]

My due dates (based on LMP):

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan 21, 2012

Today's Parent & BabyCentre due date calculator (with adjusted cycle length): Jan 21, 2012

Mittendorf-Williams:  Jan 29, 2012! did I do this right?!?!!

(I'm not planning any ultrasounds)

[Kindermama]

My due dates (based on LMP): April 1st, 2012 

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan 8th, 2012

BabyCenter due date calculator: Jan 6th, 2012

Mittendorf-Williams: Jan 11th, 2012

Based on ovulation: April 15th, 2011

Naegle: Jan 8th, 2012

BabyCenter calculator, "date of conception" option: Jan 6th, 2012

Mittendorf-Williams: Jan 11th, 2012

I think my baby will be born in late December! 

[jessica_lizette]

Based on LMP (April 1st, 2011):

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Jan 8th, 2012

BabyCenter due date calculator: Jan 6th, 2012

Mittendorf-Williams: Jan 11th, 2012

Based on ovulation (April 18th, 2011):

Naegle: Jan 12th, 2012

BabyCenter calculator, "date of conception" option: Jan 9th, 2012

Mittendorf-Williams: Jan 15th, 2012

So anywhere from the 6th til the 15th!

[Devaskyla]

I'm so happy about how many people decided to play along! I really wasn't sure anyone would

Ameliaanne If you're not sure about the M-W date, you can give me your LMP date and I'll double check it for you.

milomama I know, the range is amazing. And it really affects the pressure you get at the end, especially if you're seeing an OB, so I really wish they'd use a more accurate dating method. No wonder there's so much iatrogenic prematurity these days!

I figured out both dates with d3 and he came 2 days after my M-W date & a week or so after my Naegle's date (I can't remember exactly what it was now. )

[ameliaanne]

Thank you! LMP was 4/14/11 (caucasian, 1st child)...

[Devaskyla]

I get Jan 29 too, so yep, you must've done it right. :)

[ameliaanne]

amazing. thank you!

[Goddess3_2005]

My due dates (based on LMP):

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : Feb 2, 2012

Today's Parent & BabyCentre January 31, 2012

Mittendorf-Williams:  Feb 5, 2012

Ultrasound Feb 6, 2012

I am sticking with the last week of January because I will need to be induced because of diabetes, Addisons, ad high blood pressure/.

[cwill]

Well, Mittendorf-Williams puts me in January, so hello everyone!

I cheated and based my LMP off of date of conception (which I know within 2 days).  Anyway, I've got

Naegle: December 27th

M-W: Januaray 4th

BabyCenter: December 25th

[rtjunker]

This is my first pregnancy, I had an early ultrasound because my cycle tends to be longer than the average 28 days, and I wasn't tracking ovulation.

My due dates (based on LMP): March 27, 2011

Naegle's method : Jan 03, 2012

Mittendorf-Williams:  Jan 11, 2012

Ultrasound: Jan 10, 2012

Baby arrived: Dec 30, 2011

Edited by rtjunker - 2/4/12 at 9:24am

[danamichele]

I'll do this for this pregnancy and for my previous one.  My family has a very strong history of late births, though.  (My aunt even had twins a week late, with her second pregnancy!)  So obviously the later date was more accurate for me with my daughter, and I'd be surprised if this little one proves otherwise!

First Pregnancy:

LMP: 12/10/07

Naegle's Method: 9/17/08

Mittendorf-Williams Method: 9/25/08

Actual birth date: 10/3/08

This Pregnancy:

LMP: 3/27/11

Naegle's Method: 1/3/12

Mittendorf-Williams Method: 1/6/12

All of these dates are different from the standard 40 weeks or 280 days, however.  My first due date calculated by adding 280 days was 9/15/08 and this one is 1/1/12.  I don't know my ovulation dates, but ultrasounds during both pregnancies have confirmed LMP dates. 

[cedarwoman]

Neat!

My due dates (based on LMP): March 30, 2011

Naegle's method : Jan 04, 2012

Mittendorf-Williams:  Jan 14, 2012

Ultrasound: Jan 10, 2012

First baby :)

[chilichiki]

Naegle's method (from http://www.josephsunny.com/medsoft/nagel.html) : 2/2/2012

Today's Parent & BabyCentre due date calculator January 31, 2012

Mittendorf-Williams:  Febrary 10, 2012??? Not quite sure I calculated that one right...that seems a little far!

Based on ovulation: Feb. 1, 2012

[chilichiki]

Mittendorf-Williams:  should be Jan 31 2012 since its my second child.

On a side note-  my son came EXACTLY on his due date :o)