You should be able to add your dependants born on the same tax year or prior. Unless you are filing 2018 or earlier income tax returns first. In this case, you don't add your son as a dependant yet until you reach the 2019 tax return.
If you are using the online version --> open the drop-down menu on the left side under "my info" --> add your son in the "Dependant information" section
If you are using the Desktop version --> open the drop-down menu on the left side under "Introduction" --> add your son in the "Dependants" section
The following are screenshots for the TTO and TTD Steps.
If you still have issues after following this process, please contact our support line:
https://support.turbotax.intuit.ca/contact/
I hope this was helpful
Footnote: We at TurboTax want to encourage you and your close family to take all necessary precautions to ensure your safety. Please review the articles provided below for more information during these difficult times:
What to know about COVID-19 and Your Taxes.
https://turbotax.intuit.ca/tips/what-to-know-about-covid-19-and-your-taxes-11110
Canada’s COVID-19 Economic Response Plan
https://www.canada.ca/en/department-finance/economic-response-plan.html
COVID-19: Tax Info Centre
https://turbotax.community.intuit.ca/community/tax-topics/help/covid-19-tax-info-centre/01/1335957#M...
Canada Emergency Response Benefit (CERB)
https://turbotax.intuit.ca/tips/canada-emergency-response-benefit-cerb-11165
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