Navigation Links
Weight gain between first and second pregnancies associated with increased odds of male second child
Date:9/24/2007

Boston, MA -- A slightly greater number of males than females are born worldwide every year. In recent decades, although there are still more baby boys born than girls, there has been an apparent decline in the ratio of male to female newborns in several industrialized countries, including Canada, Denmark, England, Germany, Japan and the United States. That has led researchers to ask: Are there any factors that can influence the probability of giving birth to a baby boy or girl? A new study from the Harvard School of Public Health (HSPH) and Karolinska Institutet in Stockholm, Sweden, found that mothers who experienced an increase in weight from the beginning of the first pregnancy to the beginning of the second pregnancy may be slightly more likely to give birth to a baby boy during their second pregnancy. The study appears online September 24, 2007 in the journal Fertility & Sterility.

The results are provocative because few biological factors are known in humans to influence the chances of either conceiving or carrying to term a baby boy or girl. Our study suggests that maternal nutritional factors might play a role, said Eduardo Villamor, assistant professor of international nutrition at HSPH and lead author of the study.

Some prior studies had looked at what factors might influence the sex ratio, but evidence of causality has been weak. Parental smoking, for example, has been associated with both lower and higher sex ratios. Maternal nutritional status had been studied, but there was little evidence to support a causal relationship with the sex ratio. One of the hypotheses that the authors of this study wanted to test was whether the increase in maternal obesity in several industrialized countries could play a role in the declining sex ratio. Their study found the opposite--maternal weight gain seemed to favor the birth of boys.

The study population, drawn from the Swedish Birth Registry, included 220,889 women who had successive
'/>"/>

Contact: Todd Datz
tdatz@hsph.harvard.edu
617-432-3952
Harvard School of Public Health
Source:Eurekalert

Page: 1 2

Related biology news :

1. Research may provide new link between soft drinks and weight gain
2. Leptin-signaling Protein Maintains Normal Body Weight And Energy Balance In Mice
3. Weight control protein may yield antiobesity drugs
4. Eating, body weight regulated by specific neurons
5. An essential regulator of body weight revealed
6. Engineers discover why toucan beaks are models of lightweight strength
7. Weighting cancer drugs to make them hit tumors harder
8. Its not fair! We are programmed to resist weight loss
9. Just like us, social stress prompts hamsters to overeat, gain weight
10. Very low birth weight linked to reduced quality of life in pre-school children
11. 76 percent of workers older than 60 years of age are overweight or obese
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/2/2014)... in stride; others are done in by it. New ... of this so-called stress gap in mice with very ... researchers to better understand the development of psychiatric disorders ... animal has unique experiences as it goes through its ... alter the expression of genes, and as a result, ...
(Date:9/1/2014)... diet showed some modest improvement in the last decade ... consumption of unhealthy trans fats, but the gap in ... poor. , , An unhealthy diet is closely linked ... healthy diet is an important part of the strategy ... diet quality is important because it can offer guidance ...
(Date:9/1/2014)... It may be possible to train the brain to ... to new research by scientists at the Jean Mayer ... at Tufts University and at Massachusetts General Hospital. Published ... , a brain scan study in adult men and ... addictive power of unhealthy food while also increasing preference ...
Breaking Biology News(10 mins):Discovery hints at why stress is more devastating for some 2Discovery hints at why stress is more devastating for some 3Quality of US diet improves, gap widens for quality between rich and poor 2Quality of US diet improves, gap widens for quality between rich and poor 3Training your brain to prefer healthy foods 2
... Philadelphia have manipulated cell activity that occurs during the ... in animal studies. The finding has the potential to ... since already existing drugs might be pressed into service ... or ischemia, is a major problem in many organs, ...
... reigned supreme on the Earth, thriving by filling every ... before humans first arrived on the scene. Now, ... infinite variety of food sources may play a significant ... crisis, according to the Biodesign Institute,s Bruce Rittmann, Rosa ...
... significant step closer to climbing into the driver,s seat of ... School of Medicine in St. Louis report in Nature ... HS1, enables key functions of natural killer (NK) cells, which ... allows the NK cells to pursue their targets, latch on ...
Cached Biology News:Novel approach may protect against heart attack injury 2Can microorganisms be a solution to the world's energy problems? 2Can microorganisms be a solution to the world's energy problems? 3Can microorganisms be a solution to the world's energy problems? 4Control switches found for immune cells that fight cancer, viral infection 2
(Date:8/31/2014)... PARSIPPANY, N.J. , Aug. 31, 2014 ... New Drug Discovery program in Anti-Infective research when two ... the coveted Qualified Infectious Disease Product (QIDP) status from ... granted to drugs which act against pathogens which have ... and are identified by Centre for Disease Control (a ...
(Date:8/29/2014)... DIEGO, Aug. 29, 2014  Pfenex Inc. (NYSE ... the development of high-value and difficult to manufacture ... update and reported financial results for the second ... the successful completion of our initial public offering, ... our biosimilar product candidates, derived from our proprietary ...
(Date:8/29/2014)... VANCOUVER , Aug. 29, 2014 /PRNewswire/ - ... (OTCQX: ICOTF), today reported financial results for the ... specified otherwise, are expressed in Canadian dollars and ... Second Quarter 2014 Highlights , ... visual acuity (VA) primary endpoint for subjects enrolled ...
(Date:8/29/2014)... 29, 2014 Intrinsic Imaging, an ... GAMP® 5 compliant imaging core lab, announced today ... II clinical trial to assess a new treatment ... trial, Intrinsic Imaging will provide comprehensive imaging core ... and charter development, site qualification, site training and ...
Breaking Biology Technology:U.S. FDA Grants QIDP Status for Wockhardt Anti-Infective Drug Discovery Program 2U.S. FDA Grants QIDP Status for Wockhardt Anti-Infective Drug Discovery Program 3Pfenex Reports Second Quarter 2014 Results and Provides Business Update 2Pfenex Reports Second Quarter 2014 Results and Provides Business Update 3Pfenex Reports Second Quarter 2014 Results and Provides Business Update 4Pfenex Reports Second Quarter 2014 Results and Provides Business Update 5Pfenex Reports Second Quarter 2014 Results and Provides Business Update 6Pfenex Reports Second Quarter 2014 Results and Provides Business Update 7Pfenex Reports Second Quarter 2014 Results and Provides Business Update 8iCo Therapeutics Announces Second Quarter 2014 Financial Results 2iCo Therapeutics Announces Second Quarter 2014 Financial Results 3iCo Therapeutics Announces Second Quarter 2014 Financial Results 4Intrinsic Imaging Awarded Phase II Clinical Trial to Assess New Treatment for Non-Hodgkin’s Lymphoma 2
... 16 The landscape of scientific,publications strategy, planning ... guidelines. Half of global publications groups are fully,located ... a shift,to medical groups to increase clinical presentation, ... LLC., In a benchmarking study that included ...
... of international, multi-center registry presented at conference, ... BSX ) today announced that results from ... clinical utility,of the SpyGlass(R) Direct Visualization System will ... from May 17-22 in San Diego,CA. Registry results ...
... Products, L.P. Sponsors Program to Recognize Exemplary Work ... ... 16 CURE magazine announced the winner,and finalists of its ... the Oncology Nursing Society,s (ONS) 33rd Annual,Congress. Ortho Biotech Products, ...
Cached Biology Technology:Industry Executives Finding Value in Shift of Scientific Publications 2Boston Scientific's SpyGlass(R) Direct Visualization System to Be Prominently Featured at Digestive Disease Week(R) 2Boston Scientific's SpyGlass(R) Direct Visualization System to Be Prominently Featured at Digestive Disease Week(R) 3Boston Scientific's SpyGlass(R) Direct Visualization System to Be Prominently Featured at Digestive Disease Week(R) 4Boston Scientific's SpyGlass(R) Direct Visualization System to Be Prominently Featured at Digestive Disease Week(R) 5CURE Magazine Announces Winner of 2008 Extraordinary Healer Award 2