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Ontogeny of stool passage in low birth weight infants < or = 1500 grams
1Division of Neonatology, Cook County Hospital, Chicago Medical School, Illinois 60612.
Insights
First stool passage in preterm infants (<1500g) correlates with birth factors. Yellow stool transition depends on feeding onset and birth weight, with frequency patterns emerging over four weeks.
Area of Science:
- Neonatal physiology
- Pediatric gastroenterology
Background:
- Understanding infant stool patterns is crucial for assessing health in premature infants.
- Early stooling characteristics can indicate gastrointestinal function and feeding tolerance.
Purpose of the Study:
- To investigate the timing of first stool passage, transition to yellow stools, and stooling frequency in preterm infants (<1500g) during the first four weeks of life.
- To identify factors influencing these developmental milestones.
Main Methods:
- Prospective observational study of preterm infants (<1500g).
- Data collection on first stool passage, stool color transition, stooling frequency, feeding volume, and clinical parameters (birth weight, gestational age, respiratory distress).
Main Results:
- First stool passage (median 19 days) correlated with birth weight and gestational age, but not respiratory distress.
- Fourteen percent of infants passed their first stool after 48 hours.
- Transition to yellow stools occurred at a median of 17.6 days, influenced by feeding onset and birth weight.
- Stooling frequency increased from week 2 to week 3 and plateaued by week 4.
- Stooling frequency was not correlated with feeding volume or other studied variables.
Conclusions:
- Early stooling patterns in preterm infants are influenced by gestational age and birth weight.
- Feeding initiation plays a significant role in the transition to yellow stools.
- Stooling frequency follows a distinct developmental pattern in the first month of life, independent of feeding volume.
Abstract:
The onset of stool passage, timing of transition to yellow stools and the pattern of stooling frequency over the first 4 weeks were studied in infants < 1500 g at birth. The time of passage of the first stool (median, 19) correlated with birth weight and gestational age but not with presence or severity of respiratory distress; fourteen percent passed stool after 1st 48 hours. Transition to yellow occurred at 17.6 +/- 6.4 days and was related to the onset of feeding and birth weight. Stooling frequency was similar in Wk 2 as Wk 1, increased in Wk 3 and plateaued on Wk 4. Volume of feeding/day increased each week over that of preceding week but stooling frequency was not related to the increased volume or any of the other variables.