Final answer:
The nurse should question the prescription of lindane if the child is 18 months old due to potential neurotoxic side effects, as lindane is contraindicated in infants and young children.
Step-by-step explanation:
The clinic nurse should question the prescription of lindane for the child if it is noted in the child's record that the child is 18 months old. Lindane is known to have potential neurotoxic side effects, and its use is generally contraindicated in infants and young children because of their increased susceptibility to these side effects. In such cases, alternative treatments for scabies should be considered that are safer for young children. There is no direct contraindication related to a child being bottle-fed, having a sibling using lindane, or having a history of respiratory infections when prescribing lindane.