Clinical Research Directory

Inclusion Criteria: 1. History of or concurrent asthma or allergic rhinitis (hay fever) in either biologic parent or sibling (at least one shared biological parent) by parental report. The presence of paternal or sibling allergy or asthma will be ascertained by maternal report. 2. Maternal age greater than or equal to 18 years at the time of study enrollment. Exclusion Criteria: 1. Maternal HIV infection at time of delivery. 2. Plans for the family to move out of the geographic area during the period of the study. 3. Does not speak English. 4. Current maternal use of progesterone during pregnancy to prevent preterm birth. * Progesterone use is only an exclusion if currently being taken at time of enrollment for preterm birth. Previous use to prevent preterm birth or use at any time for other indications is allowed. 5. Pregnancy is a result of an embryo donor (egg and sperm donor pregnancies are permitted). 6. Past or current medical problems or findings from physical examination or laboratory testing which, in the opinion of the investigator or designee, may pose additional risks from participation in the study, may interfere with the participant's ability to comply with study requirements or that may impact the quality or interpretation of the data obtained from the study.