The payments were an advance credit for 2020. 2019 information was used in sending out the payments since 2020 tax returns had not been filed at the point the stimulus payments were sent out. They are being reconciled when you do your 2020 return. In some cases, people may have been given a stimulus payment based on their 2019 dependents that did not qualify based on their 2020 dependents, and vice versa.
In your particular case, you received a stimulus for 1 qualified dependent based on your 2019 return. Now that you are filing your 2020 return, your son is no longer under age 17, so he does not qualify and you only have 1 dependent that qualifies (the baby). You received the stimulus already for 1 dependent.
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