What happens: Your child won't be able to cough or make a sound.
What to do: Call for emergency help right away. If your child can cough or make a sound, do nothing until help arrives. If he can't make any sound, perform CPR if you're able.
What not to do: Don't put your finger into his mouth unless you can see the object obstructing his breathing. It may get stuck farther down his windpipe.
If you're interested in learning CPR, contact your local Red Cross.