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Scientifically-based strategies for nutrition of the high-risk low birth weight infant
1Department of Pediatrics, University of Florida College of Medicine, Gainesville 32610.
Insights
Advances in intensive care improve survival for low birth weight (LBW) infants, but their unique nutritional needs present new challenges. Optimizing nutrition for these vulnerable infants requires addressing specific metabolic and digestive immaturities.
Area of Science:
- Neonatal nutrition
- Intensive care medicine
- Pediatric gastroenterology
Background:
- Technological advancements have increased survival rates for low birth weight (LBW) infants.
- LBW infants, especially very low birth weight (VLBW) infants, have unique nutritional challenges due to limited reserves and immature systems.
- Meeting the high caloric and specific nutrient needs of VLBW infants is critical for their growth and development.
Purpose of the Study:
- To review the current understanding of nutritional requirements for LBW infants.
- To highlight the challenges in providing adequate nutrition due to physiological immaturities.
- To discuss controversies and areas needing further research in LBW infant nutrition.
Main Methods:
- Review of existing literature on LBW infant nutrition.
- Analysis of physiological differences impacting nutrient digestion, absorption, and metabolism in VLBW infants.
- Examination of current guidelines and controversies regarding macronutrient and micronutrient provision.
Main Results:
- VLBW infants require at least 120 calories/kg/day for growth and have specific amino acid needs.
- Fat digestion and absorption are limited by immature lipases and lack of bile acids.
- Controversies exist regarding carbohydrate sources, but lactose is often suitable; iron supplementation is recommended, and specific vitamin needs (D, E, A) require attention.
Conclusions:
- Optimal nourishment for high-risk LBW infants requires addressing their unique metabolic and digestive immaturities.
- Further research is needed to establish a definitive scientific basis for nutritional guidelines.
- Careful consideration of macronutrient composition, essential amino acids, and micronutrients is crucial for VLBW infant care.
Abstract:
Technological advances in the intensive care of low birth weight (LBW) infants have resulted in major increases in their survival. New challenges in meeting their nutritional needs have emerged. Very low birth (VLBW) weight infants have very little body fat or glycogen reserves at birth, making them susceptible to starvation. If fed enterally, they require at least 120 calories/kg per day for growth. Numerous immaturities in the gastrointestinal tract and liver limit protein digestion, absorption, and metabolism. Several amino acids not considered essential to the older child or adult are essential to the VLBW infant. Supplying a high protein load with an inappropriate amino acid composition may lead to metabolic imbalances. The digestion and absorption of fats differs from the older child or adult. Lingual and gastric lipases are important, and the lack of bile acids limits fat absorption. Lipoprotein lipase deficiency causes problems when too much fat or fat of incorrect composition is provided. There are controversies regarding the most appropriate carbohydrate source, but research shows that lactose remains an important carbohydrate source for most of these infants. Calcium, magnesium, and phosphorus requirements pose questions in both enterally and parenterally nourished infants. Studies of iron usage suggest that VLBW infants fed either human milk or formula should receive iron supplements. Vitamin E may be helpful in preventing oxygen toxicity. Vitamin D deficiency contributes to bone demineralization and rickets. Controversy exists regarding the correlation between vitamin A nutrition and development of chronic lung disease. Guidelines have been developed for recommended intakes, but much needs to be learned to provide a sound scientific basis upon which to provide optimal nourishment for the high risk, LBW infant.