Your child's social security number is on any of the past tax returns that you filed where the child was listed as a dependent. If you are divorced or have a legal custody agreement with the custodial parent then the attorneys who handled that would also have a copy of the child's social security number.
If none of that works then you would have to go to the social security administration. Contact them here and then tell them what is going on. They will be able to tell you what documentation they will require in order to provide you with your child's social security number.
@Speeddemon81
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