C. As an ancillary study, we have collected stool samples from the mothers in the 3rd trimester, and samples from the infants and children at 3-6 months, 1 year, and 3 years. We will sequence the stool samples for the microbiome, and we will assess the effects of the early life microbiome on the development of asthma, allergies (including food allergies and sensitization), growth and development, and obesity.