Correct Answer: B

Rationale: Breast milk or formula should be used for now because whole cow's milk is not recommended for infants under 1 year. Cow's milk is not suitable for infants under 1 year of age as it lacks essential nutrients like iron and can lead to iron deficiency. Therefore, it is important to continue with breast milk or formula to ensure the baby's nutritional needs are met. Choice A is incorrect as cow's milk is not easier to digest than formula for infants. Choice C is incorrect as the type of milk, whether whole or skim, is not the primary concern at this age. Choice D is incorrect as cow's milk can actually increase the risk of iron deficiency anemia in infants.

Correct Answer: A

Rationale: A urine pH of 4.0 is abnormally low, indicating possible acidosis or other metabolic conditions. WBC count of 1-2 cells/ml, absence of protein, and a specific gravity of 1.020 are within normal limits.

Correct Answer: C

Rationale: Malformed or low-set ears are often associated with congenital urinary tract anomalies, as both the ears and kidneys develop around the same time during fetal growth. Myelomeningocele, cardiovascular anomalies, and lower extremity defects are less commonly associated with UT anomalies.

Correct Answer: A

Rationale: Hypernatremia typically presents with lethargy, oliguria, and intense thirst due to the body's attempt to conserve water. Apathy can also occur, but lethargy and thirst are more consistent indicators.

Correct Answer: A

Rationale: The correct answer is A: 1 year. By the age of 1 year, a baby's birth weight typically triples. This period allows for significant growth and development in infants. Choices B, C, and D are incorrect because birth weight does not usually triple by 1 month, 2 years, or 6 months of age, respectively.