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

pregnancies between 1992 and 2004 (live births and stillbirths were included). The researchers analyzed the change in womens body mass index (BMI) between the first and second pregnancies. (BMI is weight in kilograms divided by the square of height in meters.) The male to female sex ratio of the second pregnancy increased linearly with the amount of weight change from the first to second pregnancy, from 1.024 in women who lost more than 1 unit BMI to 1.080 in women who gained 3 or more units (a male to female sex ratio of 1.000 would indicate an equal number of boys and girls being born). The trend was independent of obstetric complications, maternal smoking, parental age, length of the interpregnancy interval and the sex or survival status of the first-born child.

The data suggest that interpregnancy weight gain appears related to a slight increase in the probability of giving birth to a baby boy during a second pregnancy. The obesity epidemic does not appear to explain the observed decline in the sex ratio in some industrialized countries, which indicates that there are factors still unknown influencing the probability of giving birth to boys or girls.

The authors are careful to note that women should not gain weight to try to influence the sex of their baby. Weight gain before pregnancy carries significant risks to the mother and the baby, and should not be practiced to influence the odds of having a boy, said Villamor. Other factors of which weight gain is only an indicator could be at play here.


'/>"/>

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:9/30/2014)... visit the Mediterranean each year, but its deep-blue ... Earth. Almost 1,000 alien species, including fish, crustaceans, ... through human activities. In the open-access journal ... of researchers analyzed data from a new information ... how the introduction of alien species has changed ...
(Date:9/30/2014)... and strawberries all have in common? Unlike most ... and are diploid, these organisms are all polyploid, meaning ... and salmon have 3 and 4 sets of chromosomes, ... seem surprising, in fact most plant species are polyploid. ... century ago, but only recently, with the development of ...
(Date:9/30/2014)... drinking water may increase the risk of stillbirth ... led by a Boston University School of Public ... journal Environmental Health , compared 1,091 PCE-exposed ... in Cape Cod, Ma., where water was contaminated ... by the installation of vinyl-lined asbestos cement pipes. ...
Breaking Biology News(10 mins):Biodiversity in the Mediterranean is threatened by alien species 2Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 2Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 3Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 4Contaminated water linked to pregnancy complications, BU study finds 2
... European researchers have published a study which analyses the health ... of osteoporotic fractures in the population aged over 50. ... that links nutrition and fracture risk, and health economics. It ... countries which have varying levels of dairy product intake in ...
... dynamic role cilia play in guiding the migration of ... structures on the surfaces of cells, but here they ... mouse embryos, researchers were able to see cilia extending ... be receiving signals needed for neurons to find their ...
... for a boat ride or even taken a drink from the ... how valuable? That,s always been a tough question for policy makers ... societal needs that compromise it, such as the need to grow ... so has been greatly enhanced by a new policy-making framework developed ...
Cached Biology News:New health-economic model shows benefits of boosting dietary calcium intake 2Cilia guide neuronal migration in developing brain 2Study offers new tool for incorporating water impacts into policy decisions 2
(Date:10/1/2014)... BETHESDA, Md. , Oct. 1, 2014 /PRNewswire/ ... committed to the fostering and monetization of intellectual ... Spherix,s litigation against VTech and Uniden in the ... Texas has been rescheduled ... scheduled for October 2, 2014.  The Court Order ...
(Date:10/1/2014)... Irvine, CA (PRWEB) September 30, 2014 ... for user-friendly, cost-effective tools to address sales, training ... PMG has developed innovative mobile applications to ... studies, outlining the agency’s latest customized mobile app ... http://www.studiopmg.com/work . , In partnership with Toyota, ...
(Date:10/1/2014)... The U.S. Department of Labor has ... Edwardsville as part of the Trade Adjustment Assistance Community ... co-administered by the Department of Labor and Department of ... Thomas E. Perez and Secretary of Education Arne Duncan ... grants to nearly 270 colleges across the country. ...
(Date:9/30/2014)... . , Electrical ... a new kind of building block for digital integrated ... be based on three-dimensional arrangements of nanometer-scale magnets instead ... semiconductor industry CMOS fabrication of silicon chips ... the University of Notre Dame are exploring "magnetic computing" ...
Breaking Biology Technology:Markman Hearing Date for VTech and Uniden Litigation Now Set for November 10, 2014 2Digital Agency Studio PMG Launches New Case Studies on Website 2U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 2U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 3U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 4A new dimension for integrated circuits: 3-D nanomagnetic logic 2A new dimension for integrated circuits: 3-D nanomagnetic logic 3
... , SOUTH SAN FRANCISCO, Calif., Sept. ... announced the pricing of an underwritten public offering of 13,000,000 shares ... $7.25 per share. All of the shares are being offered by ... additional 1,950,000 shares to cover over-allotments, if any. The offering is ...
... , , ... ITMN ) today announced that it will be collaborating ... the research of inherited genetic factors that may play a role ... National Jewish with access to DNA collected from patients who participated ...
... , EXTON, Pa., Sept. 16 Kensey Nash ... the 2009 UBS Global Life Sciences conference at the Grand Hyatt ... , , Joseph W. Kaufmann, Kensey Nash,s President ... p.m. (ET). To hear the live webcast of the Kensey ...
Cached Biology Technology:Rigel Announces Pricing of Public Offering of 13,000,000 Shares of Common Stock 2InterMune Announces Collaboration With National Jewish Health on NIH-Supported Genetic Research in Idiopathic Pulmonary Fibrosis 2InterMune Announces Collaboration With National Jewish Health on NIH-Supported Genetic Research in Idiopathic Pulmonary Fibrosis 3
Lysozyme C (W-20)...
Request Info...
Abgene's ALTO-8 is the first automated decapper/capper for Abgene Twist-Lock tubes....
... X-Gal (5-bromo-4-chloro-3-indoyl-beta-D-galactopyranoside) is a ... identify recombinant plasmids. In ... and IPTG, lac ... blue, whereas recombinant colonies ...
Biology Products: