Typically, both parents must appear for a child to get a passport (along with the necessary proof of citizenship, photos, application and fee.) If both parents don't apply together in person, one parent may sign the consent before a notary and provide to the parent who will be applying. Quite simple, unless the parents do not agree on whether the child will receive a passport, who will hold onto the passport and when travel overseas will be permitted. What if you can't get the other parent's consent? There is a form you can use in such exigent circumstances, and be sure to attach any relevant court orders. Questions about traveling with your child overseas? Contact an experienced attorney in your jurisdiction, and be sure to plan well in advance!
For information about applying for a passport for a child under 16, click here.