Correct Answer: C

Rationale: The primary purpose of an NG tube post-surgery for Hirschsprung disease is to prevent abdominal distention by decompressing the stomach and intestines. This helps prevent complications and promotes healing.

Correct Answer: B

Rationale: If the mother is HBsAg negative, it is recommended that the child receives the first dose of the hepatitis B vaccine at birth before discharge from the hospital. This is to provide early protection against the hepatitis B virus. The second dose of the vaccine is typically given at the first well-child visit, and the third dose is usually administered at a later date. The Advisory Committee on Immunization Practices of the Centers for Disease Control and Prevention and the Committee on Infectious Diseases of the American Academy of Pediatrics govern the recommendations for immunization, including the hepatitis B virus vaccine. Choice A is incorrect as the first dose should ideally be given at birth. Choice C is incorrect as waiting until 6 months of age may leave the child vulnerable to infection during the early months of life. Choice D is incorrect as the hepatitis B vaccine is recommended for all newborns, especially if the mother is HBsAg negative, to prevent transmission of the virus.

Correct Answer: B

Rationale: Phimosis is the condition where the foreskin cannot be fully retracted over the glans penis due to a narrowing of the preputial opening. Chordee, epispadias, and hypospadias are different conditions involving the penis's structure.

Correct Answer: C

Rationale: The correct answer is C: Failure to pass meconium and abdominal distension. Hirschsprung's disease is commonly diagnosed in newborns due to the failure to pass meconium within the first 24-48 hours after birth and abdominal distension, indicating a bowel obstruction. Choices A, B, and D are incorrect because they do not correspond to the typical symptoms of Hirschsprung's disease. Acute diarrhea and dehydration, current jelly-like stools and pain, and projectile vomiting with altered electrolytes are not characteristic of this condition.

Correct Answer: B

Rationale: When taking a child's blood pressure, the nurse should select a cuff with a bladder width that covers 40% of the arm circumference at the midpoint of the upper arm. This ensures accurate readings. Choosing a cuff that covers less or more than 40% can lead to incorrect blood pressure measurements. Therefore, options A, C, and D are incorrect.