1) If you child is a U.S. Citizen go to IRS.gov and fill out the W-7A form before filing your taxes (do that now since it can take up to a month to process)
2) If your child is not a U.S. Citizen then while you are filing fill out the W-7 and then in the SS# space fill in applied for.
https://www.americanimmigrationcouncil.org/sites/default/files/research/the_facts_about_the_individual_tax_identification_number.pdf
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