The nurse is aware that the Tanner staging system for sexual maturity is:

A.Pyloric stenosis is a condition where there's narrowing of the opening between the stomach and the small intestine. It is not related to inadequate motility of the intestine.

B.Enterocolitis refers to inflammation of the small intestine and colon. While this can cause obstruction in some cases, it's not the primary cause of inadequate motility as seen in the question.

C.Encopresis is the voluntary or involuntary passage of feces outside the toilet in children who should be toilet trained. It is not a cause of mechanical intestinal obstruction.

D. Hirschsprung's disease is a congenital disorder where there is inadequate motility in part of the intestine, leading to mechanical obstruction. It usually affects the colon and is due to the absence of ganglion cells in the affected segment of the bowel.

So, Hirschsprung's disease is the specific condition that leads to inadequate motility and mechanical obstruction of part of the intestine in infants.

A. Diabetes Insipidus is associated with reduced ADH levels, leading to excessive urination and dehydration, not hyponatremia.

B. Acromegaly results from excessive growth hormone (not ADH) secretion, causing abnormal growth of tissues and bones.

C. Addison's disease involves the adrenal glands and the insufficient production of cortisol and aldosterone, not ADH-related hyponatremia.

D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH).

SIADH is a disorder characterized by the excessive release of antidiuretic hormone (ADH) from the posterior pituitary gland, leading to increased water reabsorption by the kidneys. This results in diluted blood and hyponatremia (low sodium levels) due to the retention of water. Patients with SIADH often experience fluid overload and related symptoms.