Help! McGonagall's book of babies born with magical powers

[Doreen Rich]

No: HPFGUIDX 12335

I have spent way too much time punching in word after word in the 
search here and also in the Lexicon and have come away empty handed 
or maybe I am just empty headed. :)

I am trying to find the reference to the book or scroll in which it 
is written which babies are born with magical powers and upon their 
eleventh birthdays, get sent invitations to Hogwarts.

I know this is referred to at least once, if not twice.

Thank you
Doreen