Final answer:
A baby not breathing after stimulation is likely in secondary apnea and should be provided with positive pressure ventilation to restore normal breathing.
Step-by-step explanation:
If a baby does not begin breathing in response to stimulation, you should assume he is in secondary apnea, and you should provide positive pressure ventilation. Secondary apnea refers to a more serious condition that follows primary apnea (a brief cessation of breathing), where the initial reflexes to resume breathing have failed. At this stage, the baby does not respond to stimulation, and it's crucial to intervene with positive pressure ventilation to ensure the baby receives oxygen and support until they can breathe independently.