What should investigators ask parents to determine the circumstances of an infant's death?

In cases involving the investigation of an infant's death, it is crucial for investigators to ask specific questions that can shed light on the circumstances leading to the tragic event. One of the key aspects of such investigations is understanding how the infant's airway was affected during their last moments. By inquiring whether the parents could see the baby's nose and mouth, investigators can gather information about any potential obstruction or issues that might have contributed to asphyxiation or suffocation.

This inquiry serves to clarify the conditions under which the infant was found and provides context for understanding the immediate environment. Knowing if there were any physical obstructions or any abnormal conditions relating to the infant’s face can help medical and investigative professionals piece together the events surrounding the death. This is particularly important in cases where sudden infant death syndrome (SIDS) is a consideration, as environmental factors play a significant role in such incidents.

The other options, while potentially relevant in broader medical contexts, do not specifically target the critical information needed to understand the mechanics of the infant's airway or immediate circumstances surrounding the death. Hence, while they may provide useful background information, they do not address the primary concerns that accompany an infant death investigation.