Human microbiome studies have demonstrated dynamic changes in bacterial composition in the gut during pregnancy and childhood development. Moreover, the presence of pathogenic species, or absence of beneficial species, in early childhood has been suggested to play a key role in the initiation of preterm birth, development of asthma or eczema, allergy, autism or other immunological deficiency. The goal of this study is to better understand the link between maternal and newborn microbiome. Specifically, we will investigate the microbial composition of the stool of newborn babies born to mothers with certain health issues as compared to healthy mothers. This information may help identify the factors that can help better understand the risk transmitted through the microbiome.