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The Merck Manual--Second Home Edition logo
 
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Chapter 263. Normal Newborns and Infants
Topics: Introduction | Initial Care | Physical Examination | First Few Days | Feeding | Stools and Urine | Sleeping | Physical Development | Behavioral, Social, and Intellectual Development | Promoting Optimal Development | Preventive Health Care Visits | Vaccinations
 
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Stools and Urine

Infants typically urinate 15 to 20 times per day. The urine varies in color from nearly clear to dark yellow. Stools vary a great deal from infant to infant in frequency, color, and consistency depending on the nature of the individual infant and the contents of his diet. The number of times infants defecate varies--from once every other day to 6 or 8 times a day. Stool consistency ranges from firm and formed to soft and runny. Stool color ranges from mustard yellow to dark brown. The stool of breastfed babies tends to be softer and of lighter color than that of formula-fed babies.

Diapers must be changed often to keep the underlying skin dry. Wet skin chafes more easily than dry skin and is more likely to develop diaper rash. Modern, super-absorbent disposable diapers contain a layer of gel that absorbs liquid and keeps it away from the skin. These diapers keep skin drier than cloth diapers after small to moderate amounts of urine, but diapers of any type should be changed when the skin is exposed to wetness. Bacteria normally present in stool can break down urea, a substance in urine, resulting in an alkaline pH that irritates the skin, so diapers should be checked frequently for stool and changed immediately. There are several environmental considerations related to diapers. Disposable diapers consume larger amounts of material than cloth and contribute a significant volume of landfill waste. Cloth diapers consume large amounts of energy and chemicals in the laundering process.

Baby powders help keep skin dry when the baby is sweating slightly, but they do not help keep the skin dry from urine or stool and are not essential. Powder made of talcum may cause lung problems if inhaled by infants, so parents should purchase baby powders that contain cornstarch instead.

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