In-Depth Notes on Bedsharing and Breastfeeding Related to Infant Sleep-Related Deaths
Key Authors and Affiliations
Melissa Bartick
Department of Medicine, Mount Auburn Hospital/Beth Israel Lahey Health, Cambridge, MA, USA
Department of Medicine, Harvard Medical School, Boston, MA, USA
Michal Young
Department of Pediatrics and Child Health, Howard University College of Medicine, Washington, DC, USA
Adetola Louis-Jacques
Department of Obstetrics and Gynecology, University of Florida Health, Gainesville, FL, USA
James J. McKenna
Department of Anthropology, Santa Clara University, Santa Clara, CA, USA
Department of Anthropology, University of Notre Dame, South Bend, IN, USA
Helen L. Ball
Department of Anthropology, Durham Infancy & Sleep Centre, Durham University, Durham, UK
Introduction
Breastfeeding & SIDS: Studies show that breastfeeding is associated with decreased risk of Sudden Infant Death Syndrome (SIDS) and Sudden Unexpected Infant Death (SUID).
Causal Mechanisms: The American Academy of Pediatrics (AAP) believes breastfeeding may causally reduce SIDS risk through:
Increased Arousability: Breastfed infants are more easily aroused from active sleep than formula-fed infants at 2-3 months.
Immunological Benefits: Cytokines and immunoglobulins present in breast milk may protect against infections preceding SIDS.
Myelination Differences: Brain myelination in breastfed infants may relate to SIDS risk.
Preliminary Data: Recommendations to promote human milk feeding were made based on consistent evidence supporting the protective role of breastfeeding against SIDS.
Bedsharing Context
Definition and Controversy:
Bedsharing: Sharing an adult bed, associated with increased nighttime breastfeeding.
AAP generally advises against bedsharing due to concerns about potential SIDS risks.
Hazardous Circumstances: Major risk factors include:
Sofa-sharing
Co-sleeping with a parent impaired by alcohol
Tobacco exposure during sleep
Sharing sleep surfaces with low-birth-weight or preterm infants.
Expert Disagreement: Some health authorities in the UK, Spain, and Norway have modified their stance, not advising against bedsharing in safe conditions.
Recent Research Findings
Bedsharing & Sleep-Related Death:
Studies indicate that bedsharing in the absence of hazards may not increase risk and may be protective, especially for infants beyond 3 months of age.
Epidemiological evidence shows populations with high bedsharing rates and lower sleep-related death rates.
Significant Studies:
A recent New Zealand study indicated co-sleeping was significantly risky only when parents smoke.
Breastfeeding as a Key Factor for Bedsharing
Physiological Advantages:
Bedsharing enables mothers to breastfeed more frequently, which is protective against SIDS.
Research shows that bedsharing infants rarely sleep in prone positions.
Protective positioning occurs naturally as breastfeeding mothers keep infants close.
Arousability:
Both mothers and infants are likely more arousable during bedsharing, increasing sleep synchrony and vigilance to potential dangers.
Bedsharing Confounder Analysis
Bedsharing as a Confounder:
It complicates the relationship between breastfeeding and sleep-related death since it is linked to both breastfeeding (exposure) and infant death (outcome).
Risk Factors Consideration:
Infants with pre-existing hazards (e.g., tobacco exposure) are less often breastfed and more prone to unsafe sleep positions.
Call for Larger Studies:
There's a need for larger investigations to explore the interaction between bedsharing and breastfeeding, especially in non-hazardous contexts.
Implications for Public Health
Revisiting Safety Recommendations:
Conventional guidance suggesting separate sleep in cribs for safety may need reevaluation, especially when considering bedsharing for breastfeeding infants in low-risk environments.
Effect on Breastfeeding:
Separation could negatively impact breastfeeding duration and health outcomes for both mothers and infants, potentially leading to increased SIDS rates.
Given breastfeeding's protective effects against various health issues, policies should promote informed, flexible choices around bedsharing to support breastfeeding and maternal health.
Conclusion
Need for Nuanced Understanding:
Current literature suggests that bedsharing could exhibit a protective effect when combined with breastfeeding in the absence of hazardous conditions.
This complex relationship warrants further research to guide safe practices for sleep and breastfeeding among parents.
Key Authors and Affiliations
Melissa Bartick
Department of Medicine, Mount Auburn Hospital/Beth Israel Lahey Health, Cambridge, MA, USA
Department of Medicine, Harvard Medical School, Boston, MA, USA
Michal Young
Department of Pediatrics and Child Health, Howard University College of Medicine, Washington, DC, USA
Adetola Louis-Jacques
Department of Obstetrics and Gynecology, University of Florida Health, Gainesville, FL, USA
James J. McKenna
Department of Anthropology, Santa Clara University, Santa Clara, CA, USA
Department of Anthropology, University of Notre Dame, South Bend, IN, USA
Helen L. Ball
Department of Anthropology, Durham Infancy & Sleep Centre, Durham University, Durham, UK
Introduction
Breastfeeding & SIDS: Numerous studies indicate a strong correlation between breastfeeding and a reduced risk of Sudden Infant Death Syndrome (SIDS) and Sudden Unexpected Infant Death (SUID). Breastfeeding is believed to enhance infant health and development, thereby potentially lowering mortality rates associated with sleep-related deaths.
Causal Mechanisms: The American Academy of Pediatrics (AAP) posits that breastfeeding may causally reduce the risk of SIDS through several mechanisms:
Increased Arousability: Research has shown that breastfed infants possess a higher level of arousability from sleep compared to their formula-fed counterparts, particularly noticeable around 2-3 months of age. This increased arousability may allow infants to respond better to potential threats during sleep.
Immunological Benefits: Breast milk contains a unique combination of cytokines, immunoglobulins, and other bioactive molecules that may bolster the infant’s immune system, providing critical protection against infections that could lead to respiratory illnesses or other health complications preceding SIDS.
Myelination Differences: The development of myelin in the brains of breastfed infants may differ from that of formula-fed infants, indicating there could be neurodevelopmental advantages that are linked to a reduced SIDS risk.
Preliminary Data: Various recommendations advocating for human milk feeding have emerged, grounded in consistent evidence demonstrating breastfeeding's protective role against SIDS and the importance of promoting it in public health initiatives.
Bedsharing Context
Definition and Controversy: Bedsharing is defined as the practice of sharing an adult bed with an infant and has been associated with increased nighttime breastfeeding, which promotes infant health. While the AAP generally advises against bedsharing due to SIDS concerns, it recognizes the complexities of this practice, particularly in areas where it is culturally accepted.
Hazardous Circumstances: Significant risk factors that may elevate the likelihood of SIDS in bedsharing situations include:
Sofa-sharing: Co-sleeping on couches increases the risk of suffocation and entrapment.
Co-sleeping with a parent impaired by alcohol: Impaired parents may have reduced awareness and responsiveness, heightening SIDS risk.
Tobacco exposure during sleep: Nicotine exposure may be linked to respiratory challenges and reduced arousability.
Sharing sleep surfaces with low-birth-weight or preterm infants: These infants may be more susceptible to SIDS under certain circumstances due to their development status.
Expert Disagreement: Some health authorities in the UK, Spain, and Norway propose a more nuanced perspective, suggesting that bedsharing can be safe if conditions are devoid of hazards. They emphasize the need for tailored guidance, considering cultural practices and the benefits of breastfeeding.
Recent Research Findings
Bedsharing & Sleep-Related Death: Research indicates that bedsharing can be safe and potentially protective in hazard-free environments, particularly for infants older than 3 months. The epidemiological evidence suggests that populations where bedsharing is prevalent often report lower incidences of sleep-related deaths, challenging the traditional views on its risks.
Significant Studies: A recent study conducted in New Zealand revealed that co-sleeping poses significant risks, particularly when parents smoke, underscoring the importance of context in evaluating bedsharing safety.
Breastfeeding as a Key Factor for Bedsharing
Physiological Advantages: Bedsharing promotes more frequent breastfeeding, which in turn offers protective benefits against SIDS. Supporting evidence shows that infants who bedshare are less likely to sleep in prone positions, which is often a risk factor for SIDS. Additionally, breastfeeding moms tend to position their infants safely due to proximity.
Arousability: During bedsharing, both mothers and infants exhibit increased arousability, creating a synchronized sleep pattern that enhances vigilance toward environmental dangers. This responsiveness is vital for ensuring the infant's safety during sleep.
Bedsharing Confounder Analysis
Bedsharing as a Confounder: The dynamics of bedsharing complicate the assessment of breastfeeding’s relationship to sleep-related deaths since it intertwines with both breastfeeding (as a protective factor) and outcomes associated with infant mortality (the risks).
Risk Factors Consideration: Infants exposed to preexisting hazards, such as tobacco smoke, are often not breastfed, increasing their likelihood of engaging in unsafe sleep positions, thereby augmenting the risk of SIDS.
Call for Larger Studies: There is a pressing need for expansive research to delve into the interactions between breastfeeding and bedsharing, particularly focusing on scenarios lacking hazardous conditions.
Implications for Public Health
Revisiting Safety Recommendations: The conventional guidance advocating for separate sleep in cribs for infant safety may require reevaluation. In low-risk environments, bedsharing for breastfeeding mothers could be beneficial and support both infant and maternal health.
Effect on Breastfeeding: Separation from infants could adversely affect the duration of breastfeeding and impact health outcomes for both mothers and infants, potentially resulting in higher SIDS rates.
Given the documented protective effects of breastfeeding against various health complications, public health policies should advocate for informed, flexible decisions around bedsharing to concurrently promote breastfeeding and maternal well-being.
Conclusion
Need for Nuanced Understanding: The current body of literature suggests that, in the absence of hazardous conditions, bedsharing may confer protective benefits when coupled with breastfeeding. This multifaceted relationship necessitates further research to inform safe practices concerning infant sleep and breastfeeding among caregivers.