Henrick et al. discovered that exclusively breastfed infants who were supplemented with Bifidobacterium longum subsp. infantis had significantly less enteric inflammation than control infants. See the article on page 749.

Skin color (a social determinant) and genetic polymorphism (vitamin D binding protein) interact to determine vitamin D adequacy. See the article by Newton et al. describing this interaction. The image on the cover is an example of our images series.

Wang and Zheng report that the cellular mechanism of urethral groove formation in a guinea pig model involves cell proliferation and death as well as the expression of sonic hedgehog on the ventral epithelial surface. See the article on page 452.

Blakstad et al. demonstrate that nutrition may affect richness, diversity, and microbiota composition. Favorable microbiota development was associated with improved weight gain. See the article on page 323.

Smarr et al. found no difference in growth parameters of fetuses exposed and non-exposed to maternal acetaminophen use. See the article on page 261.

Campbell et al. found that preterm neonatal neutrophils exhibited decreased mTOR pathway signaling, leading to a decrease in IL-6Rα synthesis. See the article on page 55.