Today's hair vs. baby hair

[Guest guest]

I think I have a lock of my son's baby hair (from 13 years ago), unless I'm

confusing it with my sister's.

I'm getting close to sending in a hair sample from his current age-13 head to

Doctor's Data. But, does anyone see a reason why possibly I should not *also*

have them test his baby hair? I'd love to know if he was full of mercury even

back that far to potentially figure out if it was the RhoGam shots and flu shot

(to me) and any other " stuff " that he got when he was in utero and

breastfeeding. But, mainly, I want to know what his current state is.

But, I don't want them working on sister's hair accidentally ... can they figure

out if it's from the same person?

Thanks,

M