How can I get proof of my child’s citizenship if they were born abroad?
You will have prove to the US Consulate that your child is a United States citizen, which depends on when they were born and how long you have been physically present in the United States.
If you have been physically present your whole life and you just happen to be overseas for a year or on vacation and gave birth, you are most likely not going to have an issue with getting proof that your child is a United States citizen.
The Consulate wants proof of your actually residence or physical presence in the United States for the past 5 years.