Descriptive overview of antibiotic exposures of infants over the first year of life in the New Hampshire Birth Cohort Study and over the first three years of life in infants in the DIABIMMUNE study. See article by Lebeaux et al. on page 1757.

Quantitative morphological analysis of brainstem microglial cells in lamb models of inflammation and controls. See article by Nault et al. on page 1288.

Recent SARS-CoV-2 infection or detection of its RNA in human milk is not a contraindication to breastfeeding. See article by Krogstad et al. on page 1140.

Functional-relationship web maps of genes associated with bronchopulmonary dysplasia (BPD). The discovery in a cohort of patients with BPD of a functional relationship of five genes with WNT5A suggests that Wnt pathway disruption may play a role in the disorder’s pathogenesis. See article by Akat et al. on page 888.

Overview of phototherapy-irradiance footprints of six spectral devices. See article by Dam-Vervloet et al. on page 453.

Westaway and colleagues’ study of microbiota diversity and changes in probiotic-treated very-preterm infants between admission and discharge sheds light on the role of the microbiome in development of health and disease. See article by Westaway et al. on page 142.