Final answer:
Step 2 of giving ventilations to an infant is to place your mouth tightly over both the infant's mouth and nose, ensuring you administer the correct volume of air gently.
Step-by-step explanation:
When providing ventilation to an infant, the correct second step is to place your mouth tightly over the infant's mouth and nose. This procedure is part of emergency response practices to ensure that an infant who is not breathing can receive aid. It is essential that the volume of air is appropriate for an infant's small lungs and that the ventilation is delivered gently to prevent injury. If an infant is choking, one may need first to try other techniques, such as back slaps, to remove the obstruction before attempting ventilations. In all emergency situations, it is crucial to be trained in infant CPR and to follow the latest guidelines from recognized health organizations.