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The body proportions for small-for-dates infants
Insights
Neonatal anthropometric measurements reveal distinct ethnic variations in body proportions. Prolonged intrauterine growth restriction in infants is linked to significantly disturbed skeletal proportions, particularly shorter trunks and forearms.
Area of Science:
- Neonatal studies
- Pediatric anthropometry
- Human growth and development
Background:
- Understanding neonatal growth patterns is crucial for identifying developmental deviations.
- Intrauterine growth restriction (IUGR) affects a significant number of newborns globally.
- Ethnic variations in infant body proportions are not fully elucidated.
Purpose of the Study:
- To investigate differences in trunk and limb growth relative to head growth and body weight.
- To examine these growth patterns in small-for-gestation (SGA) and appropriate-for-gestation (AGA) infants.
- To analyze variations across different ethnic groups.
Main Methods:
- Anthropometric measurements (weight, head circumference, lengths) were taken from 514 neonates.
- Comparative analysis of body proportions between SGA and AGA infants.
- Examination of growth differences across Asian, Black, and White ethnic groups.
Main Results:
- Asian infants exhibited unique body proportions, characterized by shorter trunks and forearms compared to Black and White infants.
- SGA infants showed minimal proportional differences from AGA infants, except for ponderal indices and head-to-body weight ratios.
- Very short SGA infants across all ethnic groups displayed significantly shorter trunks and forearms relative to other body measurements.
Conclusions:
- Infants experiencing prolonged intrauterine growth retardation are highly likely to present with abnormal skeletal proportions.
- Ethnic background influences neonatal body proportions, with distinct patterns observed in Asian neonates.
- Head growth appears to be proportionally unaffected by severe intrauterine growth restriction.
Abstract:
Measurements of weight, head circumference, crown-heel length, crown-rump length, rump-heel length and limb lengths were made in 514 neonates. From these measurements the differences in trunk and limb growth and their relations with head growth and body weight were examined in small-for-gestation (SGA) and appropriate grown (AGA) infants, and in different ethnic groups. We found that Asian infants had different body proportions from blacks and whites, with shorter trunks and forearms. SGA infants as a whole showed little difference in proportions from AGA infants except in their ponderal indices and the ratio of head size to body weight. However there was a preponderance of thin, relatively well-grown infants among them. When very short SGA infants were compared with AGA infants significant differences emerged, the short infants of all ethnic groups having shorter trunks and forearms in relation to their other measurements. We found no evidence of relative sparing of head growth. The results suggest that infants with prolonged intrauterine growth retardation are most likely to have disturbed skeletal proportions.