Final answer:
Alcohol, benzodiazepines, and opioids can cause a child to become unresponsive.
Step-by-step explanation:
Toxic ingestions that can lead to a child becoming unresponsive encompass a range of substances, notably including alcohol, benzodiazepines, and opioids. The peril escalates when barbiturates are involved, as their overdose intensifies the already hazardous central nervous system (CNS) and respiratory depressant effects, heightening the risk of severe outcomes. Manifestations of an overdose may manifest as sluggishness, incoordination, cognitive impairment, shallow breathing, and, in the most critical instances, progression to coma or even fatality. It is imperative to remain vigilant to these potential dangers and seek prompt medical attention in the event of suspected ingestions.