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Winter woman in field.

Winter Time Conception of Newborns Shows Increased Risk of Autism


To help understand the origin of autism, researchers at UC Davis Institute, have studied the relationship between, conception during certain months of the year, and the increased risk of autism disorders.

A population study of 6.6 million children, born in California, from 1990 to 2002 was conducted. The study's data identified 19,238 children through the California Department of Developmental Services as having developmental disorders of autism, before the age of 6.

Results showed that children conceived during the winter months of December, January, and February have a 6% higher risk of autism, compared with conception during summer months.

Researchers of this study concluded that the increased autism risk for newborns, conceived during winter months, suggests the presence of environmental causes which vary by season.

Source: Epidemiology. 2011 July 22 From the School of Medicine, University of California, Davis, CA; PMID:21543984

The March of Dimes organization describes how pregnant woman can inhale chemicals, ingest them in food or drink, or, in some cases, absorb them through the skin. See: Common Environmental Toxins and Pregnancy


are assistants of board reviewed doctors that are medical editors, authors, and reviewers, providing oversight for Heartspring.net. This article is currently undergoing doctor reveiw.

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Updated: Feb 19 2018