Please choose the correct ending to complete the given sentence: Health: [header] How to treat a conscious choking infant [title] Notice if the infant is coughing or crying. [step] If so, wait. The infant may expel the foreign object he or she is choking on.

Ending1: The infant may also cough and cry uncontrollably while choking. The infant may also make louder and louder sounds that may seem to go on indefinitely. Ending2: This is because choking objects penetrate the rigid lining of the esophagus, giving them protection against the sticky secretions. [substeps] A child breathing in through her mouth might not be able to choke on foreign objects. Ending3: [substeps] Also observe if the infant squirms around or fumbles. Growling or whimpering can also indicate an infant is choking. Ending4: Do not try to dislodge anything from the baby's throat at this point as the attempt may just push the item down further. Proceed with steps to treating a choking infant only when it is guaranteed the infant is choking.

Answer format: ending1/ending2/ending3/ending4