"A" is for AIRWAY. It is normal for an infant to take shallow and rapid breaths, so
carefully look, listen and feel for breathing. If you cannot detect any
signs of breathing, the tongue may be obstructing the infant's airway.
Although the head tilt/chin lift technique is similar to adults and children, when clearing an infant's airway
it's important not to tilt the head too far back. An infant's airway is extremely narrow and overextending
the neck may actually close off the air passage.