You may have an alphabet's worth of drugs left over from the last time you had an infant to care for, but the chances are good that many if not most of those drugs have expired "use by" dates. Before you give any drug to your baby, verify that it's safe to use on an infant, and make sure to check the "use by" date stamped on the bottle. If you can't find or decipher the batch information on the drug's packaging, don't risk it. Even if the drug is within its effective date, inspect the contents for discoloration or anything else that seems off. If it's out of date or looks suspicious, discard it.