If you audition a lot commercially and you're in the "mom-range" I'm sure you see babies all the time. But since you're asking this question, I'm guessing you don't audition a lot and you're afraid to put yourself out there because now you have a baby.
The best solution is to find a friend who can come with you and take care of the baby while you're in the room. This way if the baby gets fussy, your friend can go for a walk outside of the casting office. BUT, just in case they're looking for a mother/baby team, it could be a great opportunity having your baby there. And you'll certainly feel a lot more comfortable auditioning with your own child than a strange baby.
Disclaimer: If you do not have a friend who can come with you, it would not be professional to tote your baby into your audition- especially, unannounced. Nothing worse than improving with a guy who's supposed to be your husband and you're deciding if it's time to start a family and your baby in the corner starts crying.
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