I need to add my child

The following items must be true in order to claim your son as a qualifying child on your tax return:

For a Qualifying child 

• They must be related to you. 
• They can’t be claimed as a dependent by someone else. 
• They must be a U.S. citizen, resident alien, national, or a Canadian or Mexican resident. 
• If they are married, they can’t file a joint return with their spouse. 
• They must be under the age of 19 (or 24 for full-time students). 
  • No age limit for permanently and totally disabled children. 
• They must have lived with you for more than half the year (exceptions apply). 
• They didn't provide more than half of their own support for the year. 

You may be eligible for the following tax benefits if you claim your son as your dependent.

• Head of Household filing status
• Earned Income Credit (EIC)
• Child and Dependent Care Credit
• Child Tax Credit
• Medical expense deduction
• Education Credits

For additional information, review the TurboTax article Rules for Claiming a Dependent on Your Tax Return.

If this doesn't answer your question, please clarify and provide more information.