'Tis the season for look-alike illnesses. Our handy reference helps you identify winter's bad guys so you can treat your ailing babe.

Croup

CALLING CARD Deep, barking cough, usually at night
THE SUSPECT Croup, the swelling of the voice box and windpipe, is usually caused by a virus.
STING OPERATION Reduce swelling by taking baby into a steamy bathroom for 15 to 20 minutes to loosen congestion. A cool-mist vaporizer placed close to where baby sleeps can help too.
WHEN TO CALL FOR BACKUP If symptoms worsen — your baby's inhaling changes to a whistling sound or your baby can't cry or he's drooling excessively — call your doctor immediately.
PROBATIONARY PERIOD Expect a few difficult nights. If baby is struggling for breath, call 911 right away.

RSV

CALLING CARD Wheezing or grunting breathing
THE SUSPECT RSV, or respiratory syncytial virus, is an infection of the lungs and airways. It's fairly common and highly contagious. RSV develops from the common cold.
STING OPERATION The condition will generally run its course without medical treatment. Ease discomfort with a vaporizer, and nurse or feed formula often to prevent dehydration.
WHEN TO CALL FOR BACKUP Parents of preemies, very young infants or those with other medical conditions should call their doctors.
PROBATIONARY PERIOD Those with RSV are contagious for about a week. During that time, try to keep baby away from other children.frequently.