Off the top of my head, your estimate of 2-3 per hundred births is
probably pretty close, if you take a look over a long period.  Why
is it that cetain problems and solutions seem to come in bunches?  I
find we go weeks without using a shield and then we get several
situations where it seems to be appropriate.  I admit some of this
may be a case of "success breeding success" (it helped with mom "A",
so we're more likely to think of using it for mom "B") but I don't
think that's all of it-in the same way that twins seem to come in
bunches.  We've had more in the last month than the previous several
months combined.  They were all different gestational ages, too, so
it wasn't "something in the water" at the time they were conceived!
Winnie Mading-from Wisconsin where the weather can't decide what
season it wants to be!

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