Anything that touches the skin and absorbs is the same as eating it and can pass through the placenta to baby.
I do mine at home and after I get the dye in I set on the porch in fresh air and a friend of mine,is a stylist and she worked up until she had the baby an just had a beautiful healthy baby girl. Just make sure u have a lot of ventilation and u should be ok
Mamita2be is right. There aren't any studies on it, so the call is on you. I've dyed my hair on my last 2 pregnancies since like 6 weeks and my children are fine!
I had the same worries. The problem is that there are no studies about this topic, so actually nobody knows for sure whether it affects the foetus or not. I decided not to dye them as long as possible, but finally at week 23 I just had to. I think the further you are the lesser risk.
Go to a Salon and get done professionally. I have been getting my hair coloured and it's fine!!
I did mine at 34 weeks... Came out great! Do it!!
Do it by an open window. Also be aware hormones cab change the way the dye takes.
I've also heard I could bye it with an ammonia free dye but the color I want L'Oréal is the only one that has it and it isn't ammonia free...
You could hunt a all natural dye from earth fare or online. :)