Correct Answer: A

Rationale: In infants with heart failure, one of the key manifestations is weight gain due to fluid retention. The heart's inability to pump effectively can lead to fluid buildup in the body, causing weight gain. Bounding pulses, hyperactivity, and increased urine output are not typically associated with heart failure in infants.

Correct Answer: A

Rationale: The correct answer is A. The posterior fontanel should be closed by 4 months of age. An open posterior fontanel at this age may indicate a delay in normal closure, which could be a cause for concern and require further evaluation by the healthcare provider to ensure proper development and growth.

Correct Answer: A

Rationale: The correct answer is A. Isotretinoin is highly teratogenic, which means it can cause birth defects. Therefore, it is crucial for patients, especially females of childbearing potential, to use effective forms of birth control to prevent pregnancy while taking this medication. This is a key component of patient teaching to ensure the safe use of isotretinoin.

Correct Answer: A

Rationale: In the DSM V, one of the key diagnostic criteria for Autism Spectrum Disorder (ASD) is unusual responses to sensory input. These atypical responses can include hypersensitivity or hyposensitivity to sensory stimuli, such as sound, touch, taste, or smell. These sensory processing differences are important in the diagnosis of ASD because they can significantly impact an individual's daily functioning and behavior.

Correct Answer: D

Rationale: When caring for an infant with respiratory syncytial virus (RSV), maintaining a patent airway is crucial. Suctioning the nasopharynx as needed helps clear secretions, prevent airway obstruction, and promote effective breathing. This intervention can aid in improving the infant's respiratory status and overall comfort.