Some people steer clear of all kinds of chemicals (including deodorant! ) during pregnancy- which I think is a bit of overkill! I've coloured my hair many a time during pregnancy and so have my friends and even my own mother back in the day. By all reports chemicals are much less harsh now than in our grandmother's days and most are safe on bub. If u go to a professional hair place they'll either say no to you (if u want, say, a perm which exposes you to lengthy periods of strong chemicals), or that there'll be no problem. Usually it's the latter :) not 100% on tanning though, sorry..
I was thinking the same thing but also kind of wondering if I were to dye my hair after I have her if it'd be possible to just pump and have a supply of milk and then do it but I still dont know how long after it would be until it was safe again ... I have a male doc and idk if he'd really be much help to ask lol ... but thank you for ur comment x)
I am not sure about if they affect your milk and I know plenty of people who still do it but I personally avoid all chemical stuff of that sort when pregnant/nursing. My sister who studies the affects of these types of things always told me to stay away.