Answer to Question 1
ANS: A
Between 2 and 8 weeks after birth, an infant who has fed well and gained weight begins force-ful, nonbilious vomiting immediately after feeding. Constipation occurs because little food reaches the intestine. The signs do not support a diagnosis of meconium ileus, esophageal atresia, or galactosemia.
Answer to Question 2
ANS: B
Polyhydramnios (excessive amniotic fluid) is reported to occur in mothers of affected infants because of alterations in fetal swallowing. Esophageal malformations are not associated with en-larged placentas, short umbilical cords, or vaginal discharge.