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The thermal environment in which 3-4 month old infants sleep at home
M P Wailoo1, S A Petersen, H Whittaker
1Department of Child Health, University of Leicester.
Insights
Infants sleeping in winter were dressed and wrapped to significantly increase insulation as room temperatures dropped. Despite this, most babies maintained normal body temperatures throughout the night.
Area of Science:
- Pediatrics
- Environmental Health
- Sleep Science
Background:
- Infant sleep safety is paramount, especially during colder months.
- Parental practices for infant thermal regulation in the home environment require further investigation.
- Understanding the relationship between ambient temperature, clothing, and infant body temperature is crucial for preventing hypothermia and overheating.
Purpose of the Study:
- To investigate infant thermal insulation strategies during sleep in a cold environment.
- To assess the relationship between room temperature fluctuations, clothing/wrapping tog values, and infant body temperature.
- To determine if infants maintain safe body temperatures under parental-chosen sleep conditions.
Main Methods:
- Measurements of clothing/wrapping tog values, room temperature, and infant body temperature were taken.
- Data collected from 3-4 month old infants sleeping in home cots during winter.
- Correlational analyses were performed to examine relationships between variables.
Main Results:
- Average ambient temperature at bedtime was 18.4°C, dropping by 4.4°C overnight.
- Average total insulation (clothing + wrapping) was 14.7 tog, a significant increase.
- Infant body temperatures remained within normal ranges despite temperature drops and increased insulation.
Conclusions:
- Parents adapt infant insulation levels in response to falling room temperatures.
- Infants generally maintain thermal homeostasis despite environmental temperature variations during sleep.
- Current parental practices appear effective in regulating infant body temperature during cold weather sleep.
Abstract:
The thermal insulation of clothing and wrapping (tog value), room temperature, and body temperature was measured for 3-4 month old infants sleeping in their home cots under conditions chosen freely by parents during a cold winter. We found that ambient temperature averaged 18.4 degrees C when infants were put down, but fell by an average of 4.4 degrees C during the night. Minimum room temperature correlated with outside temperature, but most rooms were heated to some degree; smaller babies were kept in warmer rooms. The tog value of clothing before putting the baby down averaged 5.1, supplemented by 9.6 tog units of wrapping in the cot--a 188% increase for a 4.4 degrees C drop in temperature. Total tog of clothing and wrapping correlated negatively with minimum room temperature; smaller born babies tended to be more heavily wrapped. Despite the large increase in insulation in the cot, most babies maintained normal body temperatures.