How do I claim the Child Tax Credit for a baby born in 2023?

You cannot claim a baby born in 2023 yet; you'll have to wait until 2024. When you file taxes, you can only include information for that tax year. Even though you are filing your 2022 taxes in 2023, you can only include income, children, marriages, etc. that occurred in 2022.

When you file taxes next year, you can claim children that were born in 2023.