以前GOOGLE了洋人网页, 都说没有证据说有伤害.
There are very few scientific studies on the effects of hair dye used during pregnancy. In some animal studies doses 100 times the amount of hair dye used in normal application showed no significant change in fetal development.
如果不放心, 就等三个月后. 要染的话, 建议用SEMI PERMANENT 的染料, 不要染发根. 头皮是会吸收进入血液的,但头发不会. 我怀孕两次都染了. 那些洋人妈妈就更不用说了.