Journal of Human Lactation - online first articles

Journal of Human Lactation, Ahead of Print.
BackgroundSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccines are being administered around the world; however, lactating women were excluded from SARS-CoV-2 vaccine trials. Therefore, knowledge about the effect of vaccination in this specific group is limited. This information is essential to empower lactating women to make a well-informed decision on their choice for vaccination. After natural infection, SARS-CoV-2 specific antibodies are present in human milk, which might offer protection for her newborn. The dynamics of these antibodies in human milk following vaccination remain to be elucidated.Research AimTo determine the effect of vaccination with BNT162b2 on the levels of SARS-CoV-2 specific IgA in human milk.MethodsIn this prospective longitudinal study, we included lactating women who received the BNT162b2 vaccine. Human milk samples were collected prior to vaccination and 3, 5, 7, 9, 11, 13, and 15 days after both vaccine doses. Samples were analyzed using enzyme-linked immunosorbent assay against the spike protein of SARS-CoV-2.ResultsIn total, 366 human milk samples from 26 lactating women were analyzed. A biphasic response was observed, with SARS-CoV-2 specific immunoglobulin A (IgA) starting to increase between day 5 and 7 after the first dose of the vaccine. After the second dose, an accelerated IgA antibody response was observed.ConclusionAfter vaccination with the mRNA-based BNT162b2 vaccine, a SARS-CoV-2 specific antibody response was observed in human milk. The presence of SARS-CoV-2 specific IgA after vaccination is important as antibodies are transferred via human milk, and thereby might provide protection to infants against COVID-19.

Journal of Human Lactation, Ahead of Print.
BackgroundIn patients with gestational diabetes, breastfeeding decreases the lifetime risk of Type 2 diabetes by half. Lactation consultation has been shown to increase breastfeeding rates in the general population but has not been assessed in a gestational diabetes population.Research AimsTo determine if (1) a postpartum International Board Certified Lactation Consultant (IBCLC) consultation during delivery hospitalization improved inclusive (any) or exclusive breastfeeding rates at hospital discharge and 3 months postpartum in participants with GDM; and if (2) obstetrical providers’ acknowledgement of maternal feeding preference affected the rates of IBCLC consultation for patients.MethodsThis was a retrospective, comparative, secondary analysis of a prospective cohort (N = 517) study of women gestational diabetes. Participants who received a IBCLC consultation (n = 386; 74.5%) were compared to those who did not (n = 131; 25.5%). Baseline demographics, antepartum characteristics, neonatal information, mode of infant feeding at hospital discharge and 3 months postpartum, and IBCLC consultation during postpartum hospitalization were measured.ResultsAfter adjusting for baseline differences, participants who received an IBCLC consultation were more likely to report any breastfeeding at postpartum discharge (aOR 4.87; 95% CI [2.67, 8.86]) and at 3 months postpartum (aOR 5.39; 95% CI [2.61, 11.16]) compared to participants who did not. However, there was no difference in exclusive breastfeeding rates between those who did and did not receive IBCLC consultation.ConclusionInpatient IBCLC consultation during the immediate postpartum period was associated with improved rates of any breastfeeding in participants with GDM.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.
BackgroundPreterm infants are more susceptible to inflammatory complications than term infants. Human milk contains numerous bioactive components protecting the newborn infant. Antisecretory factor, a protein regulating secretory and inflammatory processes by complex binding with complement factors, is present in human milk.Research AimsTo describe antisecretory factor (1) in mother’s own milk in term and preterm infants; and (2) in donor milk before and after Holder pasteurization.MethodsThe study was prospective, longitudinal, explorative, and descriptive. Antisecretory factor-compleasome was determined using sandwich enzyme-linked immunosorbent assay in longitudinal human milk samples over 12 weeks from mothers (N = 87) of term (n = 41) and of preterm (n = 46) infants and 20 anonymized donor human milk samples before and after Holder pasteurization.ResultsAntisecretory factor-compleasome was overall higher in colostrum versus mature milk (p < .001) and no difference was found in term or preterm colostrum (p = .82). In mature milk, compleasome was higher and more variable in the preterm group (p = .01). After Holder pasteurization, compleasome levels increased (p < .001).ConclusionAntisecretory factor followed the pattern of other immunological factors with high levels in colostrum. After preterm birth, levels of antisecretory factor were higher and more variable in mature milk. Holder pasteurization did not degrade antisecretory factor, indicating preserved anti-inflammatory properties in donor human milk.

Journal of Human Lactation, Ahead of Print.
Gabrielle Palmer has written, taught, and campaigned about infant nutrition issues, particularly the unethical marketing of baby foods, since the 1970s. Her seminal book, The Politics of Breastfeeding: When Breasts are Bad for Business, has guided many breastfeeding advocates for over 40 years through three editions and multiple printings. As a breastfeeding counsellor during the 1970s, she helped establish the United Kingdom’s advocacy pressure group Baby Milk Action. She worked as a volunteer in Mozambique during the 1980s. During the 1990s she co-directed the International Breastfeeding Practice and Policy course at the Institute of Child Health, University College London, until she went to live for 2 years in China. Over the years, she has worked for various health and development agencies, including serving as HIV and Infant Feeding Officer for the United Nations Children’s Fund, New York, and also taught at The London School of Hygiene and Tropical Medicine (LSHTM). She is a mother and a grandmother. (This is a verbatim interview that has been edited for readability: MA = Maryse Arendt; GP = Gabrielle Palmer).

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.
BackgroundInappropriate marketing of human milk substitutes negatively influences efforts to protect breastfeeding. Although healthcare professionals can positively influence infant feeding decisions, government regulations permit manufacturers to communicate messages to them through advertising.Research Aims(1) To identify the extent of human milk substitute advertising in publications aimed at United Kingdom healthcare professionals and (2) to describe compliance with the International Code of Marketing of Breast-Milk Substitutes and United Kingdom Formula and Follow-on Formula Regulations.MethodsThis was a cross-sectional observational study. We reviewed publications targeting healthcare professionals working with families in the United Kingdom (N = 19). Quantity and type of human milk substitute advertisements, as a proportion of all advertising, in each publication were recorded. All unique advertisements were double assessed for compliance.ResultsHuman milk substitute advertising was found in nine (47%) of the 19 publications (four affiliated with professional associations), making up 10.3% (n = 196) of these publications’ total advertising. Of human milk substitute advertisements found, 65.4% (n = 110) were for products used to manage cows’ milk protein allergy. Of the 32 unique human milk substitute advertisements found, none complied with the International Code of Marketing of Breast Milk Substitutes or United Kingdom Formula and Follow-on Formula Regulations.ConclusionsMany healthcare professionals’ publications had non-compliant human milk substitute advertisements. There is an urgent need to ensure full compliance with international and local regulation in future advertisements and to consider whether advertisements are justified at all.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.
BackgroundIt has been demonstrated that human milk from mothers who have been infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) contains antibodies against the virus, which could play an important role in protecting the recipient infant against coronavirus disease 2019 (COVID-19). Seroconversion is measured frequently around the world, but the milk conversion rate is unknown.Research AimsTo determine (1) the prevalence and (2) the dynamics of immunoglobulin A (IgA) antibodies against SARS-CoV-2 in human milk amongst lactating mothers in the Netherlands.MethodsIn this large prospective cohort study, lactating mothers (N = 2312) were included between October 12, 2020 and February 24, 2021. Enzyme-linked immunosorbent assay was used to determine levels of IgA antibodies in human milk and immunoglobulin G (IgG) antibodies in serum against the ectodomain of the SARS-CoV-2 spike protein.ResultsA total of 691 (30.6%) participants had SARS-CoV-2 specific antibodies in human milk and/or serum. Of these participants, 524 (23.1%) had IgA antibodies against SARS-CoV-2 in human milk, and 356 (15.7%) had IgG antibodies against SARS-CoV-2 in serum. A total of 199 (8.8%) participants had antibodies in both human milk and serum. SARS-CoV-2 specific IgA antibodies in human milk remain present at least 10 months after a polymerase chain reaction confirmed infection.ConclusionThe prevalence of IgA antibodies against SARS-CoV-2 in human milk was 23.1% in our cohort. This high prevalence of antibodies in human milk might lead to passive immunity in many breastfed infants and may serve as protection against COVID-19.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.

Journal of Human Lactation, Ahead of Print.
BackgroundHuman milk is the best food for infants; however, when breastfeeding is not possible, pasteurized milk from human milk banks is the best alternative. Little has been reported about variations in the bacterial microbiota composition of human milk after pasteurization.Research aimTo characterize and compare the bacterial microbiota composition and diversity within human milk among Mexican mothers before and after the Holder pasteurization process.MethodsA cross-sectional, observational, and comparative design was used. The effect of the pasteurization process on the bacterial composition and diversity of human milk samples of donors (N = 42) from a public milk bank was assessed before and after pasteurization by high throughput deoxyribonucleic acid sequencing of V3-16S rRNA gene libraries. Sequencing data were examined using the Quantitative Insights into Microbial Ecology software and Phyloseq in R environment.ResultsA varied community of bacteria was found in both raw and pasteurized human milk. The bacterial diversity of the milk samples was increased by the pasteurization, where some thermoduric bacteria of the phyla Proteobacteria, Firmicutes, and Actinobacteria were more abundant. The source tracker analysis indicated that at most 1.0% of bacteria may have come from another source, showing the safety of the process used to treat milk samples.ConclusionThe pasteurization process increased the bacterial diversity. We selected taxa capable of surviving the process, which could proliferate after the treatment without being a risk for infants.