History Chief concern(CC) projectile nonbilious vomiting (1,2,3, 4 voracious appetite despite inability to tolerate feeds(1 may also present with dehydration or weight loss(1, 3, 4) History of present illness hpi non-vomiting at birth followed by gradual onset of nonbilious vomiting until emesis follows every feeding (1 3,4) median duration of symptoms 10 days median age at operation 40 daysHistory ◼ Chief concern (CC): ◼ projectile nonbilious vomiting(1, 2, 3, 4) ◼ voracious appetite despite inability to tolerate feeds(1) ◼ may also present with dehydration or weight loss(1, 3, 4) ◼ History of present illness (HPI): ◼ non-vomiting at birth followed by gradual onset of nonbilious vomiting until emesis follows every feeding(1, 3, 4) ◼ median duration of symptoms 10 days ◼ median age at operation 40 days