The purpose of this study is to establish the first anthropomorphic database on the development of aerodigestive structures in the fetus and, through sonographic biophysical profiles, examine the significance of fetal ingestive behaviors as predictors of postnatal feeding skills in at-risk infants. A detailed cross-sectional study of the development of the fetal upper aerodigestive tract and analysis of the progression of deglutitive skills over the course of gestation may lead to the early identification of factors contributing to neonatal swallowing dysfunction and other developmental delays. These data may provide insights into underlying intrauterine conditions associated with infant feeding difficulties. Resulting two- and three-dimensional ultrasonic data on the structural development of the upper aerodigestive system, coupled with biophysical data may be useful predictors of neonates at risk for nutritional and pulmonary sequelae. Further, sequential indices of normal swallowing-sucking skills may guide post-natal decisions for feeding "readiness" and advance the care of the premature, at-risk infant.