Infantile pyloric stenosis symptoms most commonly present between which ages?

Infantile pyloric stenosis symptoms most commonly present between which ages?

• A. 1 to 2 weeks
• B. 2 to 6 weeks
• C. 6 to 12 weeks
• D. 3 to 6 months

Answer: (B)

Infantile hypertrophic pyloric stenosis typically becomes clinically evident in the first weeks of life because the pyloric muscle thickens progressively after birth, eventually causing a gastric outlet obstruction. The most common window for symptoms is between 2 and 6 weeks of age. At this age, infants often develop nonbilious projectile vomiting, along with signs of dehydration and weight loss, and a palpable olive-shaped mass may be felt in the epigastrium or right upper quadrant, sometimes with visible peristaltic waves. Why not earlier or later? Before about two weeks the obstruction isn’t usually substantial enough to produce the characteristic vomiting, and after about six weeks the condition is less commonly diagnosed in this early infancy window, though rare cases outside the typical range can occur.

Infantile hypertrophic pyloric stenosis typically becomes clinically evident in the first weeks of life because the pyloric muscle thickens progressively after birth, eventually causing a gastric outlet obstruction. The most common window for symptoms is between 2 and 6 weeks of age. At this age, infants often develop nonbilious projectile vomiting, along with signs of dehydration and weight loss, and a palpable olive-shaped mass may be felt in the epigastrium or right upper quadrant, sometimes with visible peristaltic waves.

Why not earlier or later? Before about two weeks the obstruction isn’t usually substantial enough to produce the characteristic vomiting, and after about six weeks the condition is less commonly diagnosed in this early infancy window, though rare cases outside the typical range can occur.