I think Tylenol 3 and Lortab are almost the exact same thing. Isn't Lortab 5/500 hydrocodone/acetaminophen? I am a breastfeeder and I take Lortab periodically for severe back pain. I try to take it only when necessary and not in conjunction with other meds.
It might affect your nursing, though. It makes Aizy a little sleepless and it makes it hard for my milk to let down. Probably from the numbing action.