What happens: You won't be able to see, hear, or feel your child breathing. Her skin may be pale, gray, or even blue.
What to do: If you know how, perform CPR and chest compressions. If you're alone, call for emergency help after about a minute, even if you have to stop the CPR briefly to do so.
What not to do: If you're alone with her, don't call for emergency help before trying to perform CPR.