No - Your wife is not a dependent.
You could change your exemptions so that less or more withholding is taken from your paycheck. For a discussion of this topic, see the article: Top 5 Reasons to Adjust Your W-4 Withholding
Regardless of whether your wife is working, you would still file a joint return. Your wife does not become a dependent when she quits work, however, your baby will be and may also qualify you for the Child Tax Credit, Child Care Tax Credit and others.
[Edited | 4/8/2020 | 9:26am PDT]
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