Depending on what you get done, it's fine for pregnancy and breastfeeding. I know that if you get foils the dye isn't actually on the scalp - or is so minimal there is no risk, so I had my hair done all through pregnancy and while breastfeeding. If you are concerned maybe express before hand - I would imagine that if you had it done and then fed say a few hours later if there was any in your system it would clear out -same as if you had a glass of red etc Might be different if you have the dye all over your scalp for a long time, but even then I would think the affect would be minimal and you could still feed after a few hours. ..... HTH.