Why are first borns usually late?

Rabin said there is no known biological reason why firstborn babies would be more likely to be early or late. After 42 weeks of pregnancy, a baby is considered overdue, Rabin said, and doctors become concerned about complications, such as an aging placenta that is not able to deliver proper nutrition to the baby.

livescience.com - Royal Baby: Are Firstborns More Likely to Be Late? - Live Science

What age does a girls hips widen?

25-30 years With the onset of puberty, the male pelvis remains on the same developmental trajectory, while the female pelvis develops in an...

Last updated Mar 24, 2022

What is an F pencil?

The "F" pencil is similar in mark to an "HB" pencil, only slightly lighter. Like an "HB" pencil, it is capable of producing darker and lighter...

Last updated Aug 15, 2021

Do you really know who the “One” is? Your true Soulmate?

Promotion

The world is eagerly awaiting the birth of the royal baby, but considering this is Kate Middleton's first pregnancy, is the baby likely to be late?

Buckingham Palace has not provided an official due date for the baby but has said the newborn is expected in mid-July. Babies don't always arrive when they're supposed to, and mothers often say firstborns tend to be late, although this conclusion is typically based on anecdotal reports. [See 11 Big Fat Pregnancy Myths]. Recently, Allen Downey, a professor of computer science at Franklin W. Olin College of Engineering in Needham, Mass., did an analysis to find out if there was any truth to this old wives' tale. Downey studied a 2002 Centers for Disease Control and Prevention survey of 7,643 women, who reported 9,148 live births. He found that first babies were, indeed, slightly more likely to be born late, at 41 weeks or later, compared with other babies (second-borns, third-borns, etc.) The results showed that a firstborn baby has a 15 to 16 percent chance of being born late, compared with a 9 or 10 percent chance for other babies. Most babies were born at 39 weeks of pregnancy. However, the study also found that firstborns were also more likely to be born early, at 37 weeks or earlier. So, in general, firstborns were less likely to be born on time, said Downey, who is the author of "Think Stats" (O'Reilly Media, 2011). It's possible that first babies may be less likely to be on time because the date of conception is not accurate, Downey said. Dr. Jill Rabin, chief of ambulatory care, obstetrics and gynecology at Long Island Jewish Medical Center in New Hyde Park, N.Y., noted that a baby's due date is an estimate, and it's normal for babies to arrive two weeks before or after that day. Therefore, although parents may perceive a baby to be "late" if it arrives two weeks after the due date, this is not really the case. "When you're expecting a first baby...you're locked on to the due date, and you expect the baby on that due date," Rabin said. But even if a woman thinks she knows exactly when she conceived, "it still can be two weeks high or low, and it's considered normal," she added. Rabin said there is no known biological reason why firstborn babies would be more likely to be early or late. After 42 weeks of pregnancy, a baby is considered overdue, Rabin said, and doctors become concerned about complications, such as an aging placenta that is not able to deliver proper nutrition to the baby. Follow Rachael Rettner @RachaelRettner. Follow LiveScience @livescience, Facebook & Google+. Original article on LiveScience.com.

Which female body part attracts most men?

But that is not scientifically true. A survey and research conducted with men show that they are attracted to women's face the most with 46% votes...

Last updated May 28, 2022

Why soulmate relationships are difficult?

Soulmate relationships can be difficult because they will challenge you at times to step up and become the best version of yourself. The effort you...

Last updated Nov 23, 2018

Promotion

Is soulmate a boyfriend?

The definition of a soulmate isn't one particular person out there just for you. Nope. A soulmate connection is simply a person who could be your...

Last updated Jun 5, 2021

What if you have no marriage line?

If you have no marriage line In case you have no relationship line on your hand, it means that you have no or lack of desire for love. You may find...

Last updated Jul 5, 2022

Promotion

What birthday is no one born in?

Christmas, New Years, Christmas Eve, July 4th, Halloween, and some suspiciously Thanksgiving days all make the top 10 least common birthdays. Jul...

Last updated Oct 26, 2020

Promotion

Which country allows many wives?

Polygamy is more widespread in Africa than in any other continent, being most common in a region known as the "polygamy belt" in West Africa and...

Last updated Jan 5, 2020