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This is Dr. David
hives can come from viral infection or allergy from food or the environment
you should check your temperature to make sure you are not running a fever.
you can use over the counter tylenol and benadryl (diphenhydramine) when you are breast feeding to help calm down hives and allergic reactions on your skin
if your hives get worse or if you start to develop fevers above 101F, then you should see a doctor for evaluation and treatment.
you can also try hydrocortisone cream and benadryl cream on your skin to help calm down the hives.
let me know if you have questions.