Babies are usually just fine when flying with a cold .
If your baby is severely congested, maximize her comfort by giving her a baby antihistamine or mild decongestant an hour before the flight. Make sure she stays hydrated by drinking plenty of fluids. You also can give her saline nose drops right before takeoff to unblock a stuffy nose. Tilt her head back and put a drop or two of saline in each nostril. Let the drops sit for a minute or so.