New York, November 2, 2011 -- A woman goes into labor, and gives birth. The newborn is swaddled and placed to sleep in a nearby bassinet, or taken to the hospital nursery so that the mother can rest. Despite this common practice, new research published in Biological Psychiatry provides new evidence that separating infants from their mothers is stressful to the baby.
It is standard practice in a hospital setting, particularly among Western cultures, to separate mothers and their newborns. Separation is also common for babies under medical distress or premature babies, who may be placed in an incubator. In addition, the American Academy of Pediatrics specifically recommends against co-sleeping with an infant, due to its association with Sudden Infant Death Syndrome, or SIDS.
Humans are the only mammals who practice such maternal-neonate separation, but its physiological impact on the baby has been unknown until now. Researchers measured heart rate variability in 2-day-old sleeping babies for one hour each during skin-to-skin contact with mother and alone in a cot next to mother's bed. Neonatal autonomic activity was 176% higher and quiet sleep 86% lower during maternal separation compared to skin-to-skin contact.
Dr. John Krystal, Editor of Biological Psychiatry, commented on the study's findings: "This paper highlights the profound impact of maternal separation on the infant. We knew that this was stressful, but the current study suggests that this is major physiologic stressor for the infant."
This research addresses a strange contradiction: In animal research, separation from mother is a common way of creating stress in order to study its damaging effects on the developing newborn brain. At the same time, separation of human newborns is common practice, particularly when specialized medical care is required (e.g. incubator care). "Skin-to-skin contact with mother removes this contradiction, and our results are a first step towards understanding exactly why babies do better when nursed in skin-to-skin contact with mother, compared to incubator care," explained study author Dr. Barak Morgan.
More research is necessary to further understand the newborn response to separation, including whether it is sustained response and whether it has any long-term neurodevelopmental effects.
However, skin-to-skin contact has known benefits, and certainly, most would agree that unnecessarily stressing a newborn is unacceptable. Thus, as further evidence emerges, the challenge to doctors will be to incorporate skin-to-skin contact into routine treatment whilst still safely providing the other elements of newborn medical care.
Notes to Editors
The article is "Should Neonates Sleep Alone?" by Barak E. Morgan, Alan R. Horn, and Nils J. Bergman. The authors are affiliated with University of Cape Town, Western Cape, South Africa. The article appears in Biological Psychiatry, Volume 70, Number 9 (November 1, 2011), published by Elsevier. The authors' disclosures of financial and conflicts of interests are available in the article.
John H. Krystal, M.D., is Chairman of the Department of Psychiatry at the Yale University School of Medicine and a research psychiatrist at the VA Connecticut Healthcare System. His disclosures of financial and conflicts of interests are available here.
Full text of the article mentioned above is available upon request. Contact Donna Santaromita at firstname.lastname@example.org to obtain a copy or to schedule an interview.
About Biological Psychiatry
Biological Psychiatry is the official journal of the Society of Biological Psychiatry, whose purpose is to promote excellence in scientific research and education in fields that investigate the nature, causes, mechanisms and treatments of disorders of thought, emotion, or behavior. In accord with this mission, this peer-reviewed, rapid-publication, international journal publishes both basic and clinical contributions from all disciplines and research areas relevant to the pathophysiology and treatment of major psychiatric disorders.
The journal publishes novel results of original research which represent an important new lead or significant impact on the field, particularly those addressing genetic and environmental risk factors, neural circuitry and neurochemistry, and important new therapeutic approaches. Reviews and commentaries that focus on topics of current research and interest are also encouraged.
Biological Psychiatry is one of the most selective and highly cited journals in the field of psychiatric neuroscience. It is ranked 4th out of 128 Psychiatry titles and 15th out of 239 Neurosciences titles in the 2010 ISI Journal Citations ReportsŪ published by Thomson Reuters. The 2010 Impact Factor score for Biological Psychiatry is 8.674.
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