> It is a good idea to apply for your child's Social Security number and birth certificate at birth. If you apply at the hospital, the state agency that issues birth certificates will share your child's information with us. Then, we will mail the Social Security card to you. If you wait to apply, there may be delays while we verify your child's birth certificate.
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https://www.ssa.gov/faqs/en/questions/KA-01969.html
> It is a good idea to apply for your child's Social Security number and birth certificate at birth. If you apply at the hospital, the state agency that issues birth certificates will share your child's information with us. Then, we will mail the Social Security card to you. If you wait to apply, there may be delays while we verify your child's birth certificate.