Final answer:
For an alert choking infant, the first response should be to administer back blows. If unsuccessful, follow up with chest compressions, and seek emergency assistance if the obstruction does not clear.
Step-by-step explanation:
The first maneuver you should do on an alert (conscious) choking infant is back blown. If an infant is choking, hold the infant face down on your forearm, supported by your thigh, and give five firm blows with the heel of your hand between the infant's shoulder blades. If the back blows do not dislodge the object, you can then proceed with five chest compressions using two fingers at the center of the chest. Unlike with adults or older children, do not perform abdominal thrusts on infants as this can cause injury. The Heimlich maneuver and other advanced measures should be used if back blows and chest compressions are not effective, and only by someone trained to perform them on infants. Immediate medical attention should be sought if the object is not dislodged quickly.