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It's extremely unlikely that your baby will get strep. Babies rarely become infected, probably because the antibodies they receive before birth are still at work and most babies have very small tonsils.
To be safe, though, try to keep your older child away from your baby until the older child has been on antibiotics for 24 hours and no longer has a fever. (If he still has a fever, he may have an additional infection, like a virus, that won't respond to the antibiotic. You don't want your baby catching that, either.) Don't let them share eating utensils, cups, or kisses.
If your baby does catch strep from his sibling, it'll show up in about two to five days, so you can stop worrying about it after that. Be sure to contact your baby's doctor if you have any concerns about your baby's health.