The Mom2Baby Pilot study will last about 4 months. Up to 20 pregnant women who were considered normal weight prior to pregnancy will be enrolled in the study. The infants born to these pregnant women will also be enrolled after birth. Archive blood, archive breast milk, and clinical assessment data from up to 20 participants who were considered overweight or obese at enrollment in the Expecting Success study conducted at Pennington Biomedical Research Center (NCT01610752) may be used to test the primary hypothesis as well as additional hypotheses.