Post-discharge nutrition and the VLBW infant: To supplement or not supplement?: a review of the current evidence

Growth at 2 years corrected age in preterm infants discharged on two different breast milk enhancements: An observational study

OBJECTIVE

Breast milk (BM) enhancement is often used to meet the nutritional needs of preterm infants after hospital discharge to achieve optimal growth. This study compared growth at 18-28 months corrected age (CA) among very preterm (VP) and very low birth weight (VLBW) infants discharged from the neonatal intensive care units (NICUs) on two BM enhancements.

METHODS

We conducted a retrospective chart review study of infants born between January 1, 2013 and December 31, 2017, with gestational age < 32 weeks or birthweight < 1500 g, discharged from the NICU on BM enhancements; fortification of BM with infant formula additives (BM-F) or unfortified BM supplemented with bottle feeds of infant formula (BM-S). BM enhancements were nonrandomized and determined by the medical team. A linear mixed model regression analysis with propensity score matching was used to estimate the adjusted associations between the nutrition plan at discharge and growth outcomes at 18-28 months CA follow-up.

RESULTS

Two hundred and fifty-one VLBW/VP infants were included. Compared with BM-S, infants discharged on BM-F were more likely to continue receiving BM at 8-12 months CA, and had lower head circumference, weight-for-length z scores, and higher incidence of moderate malnutrition (p ≤ 0.01). After adjusting for confounders, discharge on BM-F was associated with a lower incidence of overweight/obesity at 18-28 months CA (odds interval: 0.45; confidence interval: 0.21-0.96; p = 0.04).

CONCLUSIONS

This retrospective study suggests that VLBW/VP infants discharged on BM-F received BM longer, had lower growth parameter and were less likely to be overweight/obese at 18-28 months CA. Further studies are needed to evaluate the role of postdischarge nutrition on preterm born children's growth, metabolic disease, and neurodevelopmental outcomes.

Le suivi de l'extrême prématuré après le congé des soins intensifs néonatals

La survie des extrêmes prématurés (moins de 28 semaines d'âge gestationnel) s'est améliorée au fil du temps. Bon nombre s'en sortent bien et ont une bonne qualité de vie. Ils demeurent toutefois vulnérables à des problèmes de santé, y compris des difficultés neurosensorielles et neurodéveloppementales, que les médecins de première ligne, les pédiatres et les cliniques spécialisées doivent surveiller. Le présent document de principes passe en revue les conséquences médicales et neurodéveloppementales potentielles pour les extrêmes prématurés dans les deux ans suivant leur congé et fournit des stratégies de counseling, de dépistage précoce et d'intervention. Parce qu'ils sont tous liés à l'extrême prématurité, la dysplasie bronchopulmonaire ou les troubles respiratoires, les problèmes d'alimentation et de croissance, le développement neurosensoriel (vision et audition), la paralysie cérébrale et le trouble du spectre de l'autisme doivent faire rapidement l'objet d'une évaluation. Pour évaluer la croissance et le développement, il faut corriger l'âge chronologique en fonction de l'âge gestationnel jusqu'à 36 mois de vie. Par ailleurs, l'attention au bien-être émotionnel des parents et des proches fait partie intégrante des soins de qualité de l'extrême prématuré.

Follow-up care of the extremely preterm infant after discharge from the neonatal intensive care unit

The survival of babies born extremely preterm (EP, <28 weeks gestation) has improved over time, and many have good outcomes and quality of life. They remain at risk for health issues, including neurosensory and neurodevelopmental difficulties requiring monitoring by primary physicians, paediatricians, and specialty clinics. This statement reviews potential medical and neurodevelopmental consequences for EP infants in the first 2 years after discharge and provides strategies for counselling, early detection, and intervention. EP-related conditions to assess for early include bronchopulmonary dysplasia or respiratory morbidity, feeding and growth concerns, neurosensory development (vision and hearing), cerebral palsy, and autism spectrum disorder. Correction for gestational age should be used for growth and development until 36 months of age. Integral to quality care of the child born EP is attention to the emotional well-being of parents and caregivers.

Complementary feeding in preterm infants: a position paper by Italian neonatal, paediatric and paediatric gastroenterology joint societies

Nutrition in the first 1000 days of life is essential to ensure appropriate growth rates, prevent adverse short- and long-term outcomes, and allow physiologic neurocognitive development. Appropriate management of early nutritional needs is particularly crucial for preterm infants. Although the impact of early nutrition on health outcomes in preterm infants is well established, evidence-based recommendations on complementary feeding for preterm neonates and especially extremely low birth weight and extremely low gestational age neonates are still lacking. In the present position paper we performed a narrative review to summarize current evidence regarding complementary feeding in preterm neonates and draw recommendation shared by joint societies (SIP, SIN and SIGENP) for paediatricians, healthcare providers and families with the final aim to reduce the variability of attitude and timing among professionals.

Postdischarge Nutrition in Preterm Infants

The field of postdischarge nutrition for preterm infants arose when concerns that using diets suitable for term infants-breastfeeding without fortification or standard formulas-might not meet the postdischarge nutritional needs of infants born preterm, who often exhibited growth restriction and evidence of undernutrition. A decade ago, there were already 27 randomized controlled trials (RCTs) of nutritional supplementation from which an eligible subsample of trials have provided evidence on whether nutritional fortification of human milk or nutrient-enriched formula favorably affects postdischarge growth in these infants. These RCTs also allowed exploration of the quality of growth, bone mineralization, and the ad libitum-fed infant's own regulation of milk volume and nutrient intake. Importantly, such RCTs, augmented by observational data on the links between growth and neurodevelopment, have allowed exploration of the potential impact of postdischarge nutrition on neurocognitive function. However, the interpretation of published data and the implication for practice has proven difficult and contentious. In this review, we examine, and to an extent reanalyze, existing evidence to elucidate its strengths and limitations, with the goal of adding more clarity to the ways in which this sizeable body of clinical scientific research may have a positive impact on the postdischarge nutritional approach to infants born preterm.

Preterm's Nutrition from Hospital to Solid Foods: Are We Still Navigating by Sight?

As preterm birth rates are globally increasing, together with research on preterms’ peculiar needs, neonatologists are still facing the challenge of how to properly feed them. The need to strike a balance between excessive catch-up growth and extrauterine growth retardation, both leading to adverse outcomes, is made even more difficult by the broad range of preterms’ needs. Although mother’s fresh milk is undoubtedly the best nourishment, its availability during hospital stay is often lower than recommended, and its fortification at discharge is still an open issue. Formula milks are available as an alternative to breast milk. However, choosing the right formula requires a thorough evaluation of the infant’s perinatal history and targets. Last but not least, adequate timing and initiation of weaning in premature babies are still a poorly explored matter. This narrative review aims at evaluating the multitude of issues to consider when feeding preterms in the three stages of their first life: in-hospital care, discharge, and, eventually, weaning. Given the current absence of internationally shared guidelines, understanding the potential pitfalls of preterms’ nutrition could help us trace the right path for the right preterm.

Comparison of Types of Breast Milk Fortification at Discharge from the Neonatal Intensive Care Unit and Breast Milk Feeding Rates and Growth at 4 Months Corrected Age

Background: Effects of breast milk (BM) enhancement on long-term BM feeding in preterm infants discharged from the neonatal intensive care unit (NICU) have not been examined previously. This study compares any BM feeding rates at 4 months corrected age (CA) in preterm infants discharged from the NICU on BM enhancement by fortification of expressed BM with infant formula additives (BM-F) versus BM supplemented with infant formula feeds (BM-S). Subjects and Methods: We compared infants born between January 1, 2013, and December 31, 2017, with gestational age <32 weeks or birth weight <1500 g, discharged home on BM-F or BM-S from two NICUs and followed at 4 months CA. Multivariate logistic regression with propensity scoring estimated the adjusted associations between nutrition at discharge and any BM feeding at 4 months CA. Results: Two hundred eighty-five infants were followed at 4 months CA. Infants discharged on BM-F were more likely to have mothers with multiple gestation, private insurance and not Caucasian, initiate feeds of human milk, be discharged from NICU-1, and receive any BM at 4 months CA (p < 0.03). No significant difference in growth parameters <10th percentile at 4 months CA was observed between the two groups. After adjusting for confounding factors, discharge from the NICU on BM-F was significantly associated with BM feeding at 4 months CA (odds ratio: 3.89, 95% confidence interval 1.66-9.14, p = 0.002). Conclusion: In this observational study, preterm infants receiving BM fortified with formula powder additives at discharge from the NICU had better BM feeding outcomes without poor growth at 4 months CA relative to those infants receiving BM supplemented with infant formula feeds.

The Impact of Kidney Development on the Life Course: A Consensus Document for Action

Hypertension and chronic kidney disease (CKD) have a significant impact on global morbidity and mortality. The Low Birth Weight and Nephron Number Working Group has prepared a consensus document aimed to address the relatively neglected issue for the developmental programming of hypertension and CKD. It emerged from a workshop held on April 2, 2016, including eminent internationally recognized experts in the field of obstetrics, neonatology, and nephrology. Through multidisciplinary engagement, the goal of the workshop was to highlight the association between fetal and childhood development and an increased risk of adult diseases, focusing on hypertension and CKD, and to suggest possible practical solutions for the future. The recommendations for action of the consensus workshop are the results of combined clinical experience, shared research expertise, and a review of the literature. They highlight the need to act early to prevent CKD and other related noncommunicable diseases later in life by reducing low birth weight, small for gestational age, prematurity, and low nephron numbers at birth through coordinated interventions. Meeting the current unmet needs would help to define the most cost-effective strategies and to optimize interventions to limit or interrupt the developmental programming cycle of CKD later in life, especially in the poorest part of the world.

Growth in very preterm children: Head growth after discharge is the best independent predictor for cognitive outcome

BACKGROUND

The contribution of growth parameters to the cognitive outcome of very low birth weight (VLBW)/very preterm (VP) infants is difficult to disentangle from other preterm-birth related factors.

AIMS

We hypothesized that long-term cognitive and motor outcome of VLBW/VP infants is most strongly associated with growth in head circumference after hospital discharge.

STUDY DESIGN

Single-centre prospective longitudinal study: anthropometric measures at different time points (birth, discharge, school-age).

SUBJECTS

136 VLBW/VP infants (<32weeks gestation/birth weight<1.500g).

OUTCOME MEASURES

Cognitive and motor function (Kaufman Assessment Battery for Children; Movement Assessment Battery for Children) at school-age (6.7-10.0years, mean=8.2).

RESULTS

In hierarchical multiple regression analyses, growth from birth to discharge significantly predicted cognitive outcome (weight: R²_change=0.063, p=0.014; length: R²_change=0.078, p=0.007; HC: R²_change=0.050, p=0.030), as well as weight gain (R²_change=0.096, p=0.001) and head growth (R²_change=0.134, p<0.001) from discharge to school-age. While most growth parameters, especially those from birth to discharge, were significantly influenced by prenatal growth and immaturity related morbidity (R²=0.151 to 0.605, all p≤0.001), head growth after discharge was not (R²=0.029, p=0.461).

CONCLUSIONS

Amongst all anthropometric measures, head growth between discharge and school-age is the best independent predictor for cognitive outcome in VLBW/VP infants. Determinants of head growth after discharge need further studies to identify targets for intervention.

Early versus Delayed Human Milk Fortification in Very Low Birth Weight Infants-A Randomized Controlled Trial

OBJECTIVE

To compare the effect of initiating human milk fortification at 2 different feeding volumes on feeding intolerance and the time to reach full feeding volume.

STUDY DESIGN

Very low birth weight infants (n = 100) were prospectively randomized to early fortification (EF) (beginning at a feeding volume of 20 mL/kg/d) or delayed fortification (at a feeding volume of 100 mL/kg/d). We employed a standardized feeding protocol and parenteral nutrition guidelines for the nutritional management of all study infants.

RESULTS

The median days to reach full feeding volumes were equivalent in the 2 groups (20 vs 20, P = .45). No significant difference was observed in the total number of episodes of feeding intolerance (58 vs 57). Two cases of necrotizing enterocolitis (Bell stage ≥2) and deaths occurred in each group. Median daily protein intake (g/kg/d) was higher in EF group in week 1 (3.3 [3.2, 3.5] vs 3.1 [2.9, 3.3], P < .001), week 2 (3.6 [3.5, 3.8] vs 3.2 [2.9, 3.4], P < .001), and week 3 (3.7 [3.4, 3.9] vs 3.5 [2.8, 3.8], P = .006). Cumulative protein intake (g/kg) in the first 4 weeks of life was higher in EF group (98.6 [93.8, 104] vs 89.6 [84.2, 96.4], P < .001).

CONCLUSIONS

Very early human milk fortification may improve early protein intake in very low birth weight infants without increasing frequencies of adverse events.

TRIAL REGISTRATION

ClinicalTrials.gov: NCT01988792.

Challenges in breast milk fortification for preterm infants

PURPOSE OF REVIEW

To outline new evidence published from 2013 to 2014 about breast milk fortification in preterm infants.

RECENT FINDINGS

Breast milk is the feeding choice for preterm infants because of its immunoprotective properties. However, breast milk's nutrient content is not sufficient for preterm infants, and interindividual variation is high. The variation challenges standard fortification, which assumes a standard breast milk composition. Two new fortification strategies (adjustable fortification and target fortification) optimize macronutrient intake and improve growth. Adjustable fortification uses blood urea nitrogen levels to adjust fortifier strength. Target fortification analyzes breast milk and fortifies macronutrients individually to achieve targeted intake. Its feasibility is shown in clinical routine. Current breast milk analyzers used for target fortification achieve acceptable precision for protein and fat but not for lactose and energy. Evidence of benefits for postdischarge breast milk fortification is lacking. Eliminating cow's milk products and feeding exclusively breast milk may decrease the occurrence of feeding intolerance and necrotizing enterocolitis. To facilitate exclusively breast milk diets, a collaboration of prenatal, nutrition and lactation stakeholders is key. Fortification increases osmolality; however, safety cutoffs to prevent necrotizing enterocolitis are unclear. There is also new evidence that composition and structure of various macronutrients and micronutrients affect growth and development, and might play a role in future fortification concepts.

SUMMARY

Recent research focuses on the variability of breast milk composition, its impact on postnatal growth patterns and the usefulness of target fortification. As well, diets exclusively composed of human milk are a promising approach to improve feeding tolerance. For safe fortification, osmolality cutoff levels are needed.