Moomoomie I agree with whodunnit (not because I have any specific experiene of talkative Brownie or Rainbow leaders, I found our ones very nice) but because if you say FAS you either leave the leader thinking you drank in pregnancy and caused the condition (which you did not, obviously!) or you could say your child is adopted.
I know a lady whose adopted child was quite a handful and she found it difficult at church with everyone knowing that he had been adopted and so moved church and didn't tell people he had been adopted. She just explained what his behaviour was like and how to deal with it without explaining exactly what his condition was.
Your child has a medical condition you did not cause, if I were in your shoes (in my humble opinion) I would not want the leaders to think I was responsible for the condition and I may well not want to tell people they had been adopted, although I am not sure about that one. I know a lot of people in my area and have no plans to move so if/when our little one is placed I expect most people I bump into will know that my child is not a birth child.
Anyway, is it possible to just describe her behaviour, the fact it is caused by problems in her brain which happened when she was in vitro (I am not sure if this is an accurate descritpion of FAs but if it is anywhere like the truth this would be enough for me as a lay person to know what it means). I am not technical medical terms would help the individual person to understand it more.
I think it is totally your call here and you will have to decide what is best but I would be careful how much you say because you can always add more information but can never take it away, IYSWIM.
According to this website
www.braidedcord.net/about_FASD.html
(don't know if you know this one, I just had a quick look) no amount of alcohol is safe in pregnancy.
I certainly do not think people know that at all! They know you should not drink or drink much but some people may not now for weeks or even a couple of months that they are actually pregnant.
Is it true that it is not necessarily alcoholics or women who drink excessively in pregnancy that may cause FAS?
If so and if you do decide to tell people that your child has FAS and not that they have been adopted then I think it would be helpful to you get accross the message that it is not necessarily alcoholics or women who drink excessively in pregnancy that may cause FAS.
If it only affects the pregnancy of women who drink excessively then you are kind of labelling yourself as that, which I think would be difficult for your Brownie leader to understand, it may affect the amount of credance she give to your opinons and in a way to the amount of help she is willing to give if she loses empathy with your child. Does that make sense?
Anyway, not sure if I am making sense.
Good luck with whatever you decide to do.