dying hair while breastfeeding??

Paige
So I was boasting today how as soon as I have this baby I'm going to dye my hair pastel pink
 ( been in the army since I was 17 and am so ready to do something crazy with my hair lol) well my male coworker gasped and was like whaaaat?! You can't do that while breastfeeding!! Think of all the chemicals being absorbed into your skin! That's all going to your baby!
Whaaaa??😱🤷🏼‍♀️🤷🏼‍♀️🤷🏼‍♀️ is that even a thing??
Goodness! Lol  
Update: thank you guys for your responses! But I do not mean while pregnant, I mean just while breastfeeding.