Exploring the relationship between breastfeeding and the incidence of infant illnesses in Ireland: evidence from a nationally representative prospective cohort study

Childhood Nutritional Factors and Cardiometabolic Outcomes at 9-11 y of Age: Findings from the ROLO Longitudinal Birth Cohort Study

BACKGROUND

Childhood represents a critical period of nutritional risk in the programming of later chronic disease. Few longitudinal studies have explored repeated measures of nutrition throughout the first decade of life in relation to preteen cardiometabolic outcomes.

OBJECTIVES

This research aimed to explore associations of early feeding practices (human milk exposure and duration and timing of introduction to solids) and childhood dietary quality and inflammatory scores (at 5 and 9-11 y and change during childhood) on preteen cardiometabolic outcomes.

METHODS

This is an analysis of children from the ROLO longitudinal birth cohort study (n = 399). Information on early feeding practices were obtained at postnatal study visits. Food frequency questionnaires collected maternal-reported dietary intakes for each child at 5 and 9-11 y of age. Healthy Eating Index (HEI)-2015 and the Children's Dietary Inflammatory Index (C-DII) scores were calculated. Anthropometry, body composition, blood pressure, heart rate, cardiorespiratory endurance, and blood biomarkers were obtained at 9-11 y. Crude and adjusted linear regression models examined nutritional exposure associations with preteen cardiometabolic outcomes.

RESULTS

In the adjusted model, any human milk exposure was associated with lower body fat (%) at 9-11 y (β: -2.86; 95% confidence interval [CI]: -5.46, -0.27; P = 0.03), than never receiving human milk. At 5 y, diet scores were favorably associated with lean mass at 9-11 y (P < 0.05 for both). Higher preteen HEI-2015 scores were associated with lower preteen leptin levels (tertile 3 compared with tertile 1-β: -2.92; 95% CI: -5.64, -0.21; P = 0.03). Diet quality significantly deteriorated (HEI-2015 score decreased) and became more proinflammatory (C-DII score increased) from 5 to 9-11 y of age. Diet quality/inflammation deterioration (compared with improvement) or overall change in dietary scores were not related to preteen cardiometabolic outcomes.

CONCLUSIONS

Exposure to human milk in early life was associated with lower preteen adiposity, irrespective of duration. Diet quality/inflammatory potential deteriorated between early childhood and the preteen years, highlighting a potential period for intervention.

Research Trends on Self-Efficacy in Breastfeeding Mothers During 2000-2023: A Bibliometric Analysis

Self-efficacy is important in supporting breastfeeding behaviors and enhancing breastfeeding practices. This study aimed to explore research trends, identify knowledge gaps, and provide a comprehensive overview of breastfeeding self-efficacy. Data were retrieved from the Scopus online database on March 20, 2024, encompassing articles published in English between 2000 and 2023. The search strategy focused on articles containing the keywords "self-efficacy," "breastfeeding," and "mother." VOSviewer version 1.6.19 was then used to map the data and visually identify research clusters. The analysis yielded a significant increase in breastfeeding self-efficacy research over the past 2 decades. The United States led in publication numbers (117 documents), while Canada dominated citations (2792 citations). Furthermore, the analysis identified 8 critical themes in 8 different clusters, encompassing various aspects of breastfeeding, including determinants, behaviors, interventions, and mental health considerations during lactation, and employed research methodologies. One crucial gap identified in this study pertains to low breastfeeding social support. This includes a lack of support from peer groups, social networks, and social media platforms. Addressing this gap can be a valuable reference point for developing future interventions to bolster breastfeeding self-efficacy. Bibliometric analysis contributes to exploring research trends, identifying knowledge gaps, and providing a comprehensive overview of breastfeeding self-efficacy.

'It's far from the norm': breastfeeding beyond 1 year in the Republic of Ireland

Breastfeeding is the optimal form of nutrition for infants and young children. The World Health Organization recommends that babies are breastfed exclusively for the first 6 months of life, and up to the age of 2 years or beyond in combination with complementary food. Breastfeeding initiation and continuation rates are suboptimal globally and very low in the Republic of Ireland where health promotion initiatives and healthcare professional support predominantly focus on the important phase of initiation and early months of the breastfeeding journey. This qualitative descriptive study aimed to explore the experiences of women who chose to breastfeed their children beyond 1 year of age in the Republic of Ireland. Fourteen women participated in semi-structured interviews. Interviews were transcribed verbatim and thematic analysis was conducted. The analysis generated three overarching themes: (1) Influences on breastfeeding beyond 1 year, (2) Sustaining breastfeeding and (3) Benefits of breastfeeding beyond 1 year. Family, friends, peers, culture and commercial milk formula marketing had an influence on breastfeeding journeys. Support, determination, knowledge, bed-sharing and Covid-19 pandemic social restrictions helped to sustain breastfeeding beyond 1 year. Benefits of breastfeeding beyond 1 year such as nutrition, strengthening of emotional bonds, development of a parenting tool, and protection of child and maternal health were identified. Our findings support the need for discussions and further research on the normalization of breastfeeding beyond 1 year in the Republic of Ireland, targeted health promotion initiatives and education programmes for healthcare professionals on supporting the continuation of breastfeeding.

Maternal smoking around birth and its influence on offspring allergic diseases: A mendelian randomization study

Objective

The influence of maternal smoking around birth (MSAB) on offspring allergic diseases, specifically childhood asthma (CA), allergic rhinitis (AR), allergic conjunctivitis (AC), and atopic dermatitis (AD) remains incompletely understood. We performed a rigorous mendelian randomization (MR) study to obtain the unconfounded association between MSAB and allergic diseases in offspring with and without adjustment for the effect of breastfeeding.

Methods

Utilizing publicly available information of MSAB, breastfeeding, CA, AR, AC, and AD from large-scale genome-wide association studies (GWAS), we performed a two-sample mendelian randomization (TSMR) analysis to assess the respective causal relationship of MSAB and breastfeeding to allergic diseases in offspring. To get a reliable conclusion, MR Egger regression, weighted median, and inverse variance weighted (IVW) were employed to estimate the causality, with IVW as the primary analysis. Multivariate MR (MVMR) analysis was used to assess the effect of MSAB on allergic diseases after adjusting for breastfeeding's impact. Sensitivity analysis was conducted using the Cochran Q test, MR-Egger, and leave-one-out approaches to ensure the reliability and stability of results.

Results

The TSMR analysis demonstrated MSAB increased the risks of CA (PIVW = 0.013, OR: 1.018, 95%CI: 1.004 to 1.033) and AD (PIVW = 0.006, OR: 8.293, 95%CI: 1.815 to 37.884) in offspring. Conversely, breastfeeding decreased the risk of CA (PIVW <0.001, OR: 0.946, 95%CI: 0.918 to 0.974). MSAB still increased the risks of CA (P = 0.0497, OR: 1.013, 95%CI: 1.000017 to 1.026) and AD (P = 0.003, OR: 13.800, 95%CI: 2.490 to 269.246) after adjusting for breastfeeding. We observed no strong indication of a negative causality between MSAB and AC and AR.

Conclusion

Our findings provided robust evidence of the adverse effects of MSAB on offspring. We emphasized the urgency of smoking cessation around birth and the importance of breastfeeding even in smoking mothers.