I did while on both of them. I contacted the La Leche League and got the "ok." If the baby is a newborn, and you're on high doses, it's not always OK, but my dtr was older and the doses were not high, so it was fine.

It is not OK to breastfeed while on other immune suppressing drugs. I'm not sure about IVIG, either.

Good luck! You have a lucky baby!!!!