The Slayers we see in Buffy the Vampire Slayer become Slayers when they are (at least) teenagers.
In the series finale,
Willow activates all the potentials in the world and they all receive the slayer powers.
Does this affect future potentials that weren't born yet?
Do they get powers from the moment they were born? I can imagine the danger to the people around them when a slayer baby or toddler gets upset.
Is there any extra-canonical reference to what happens with them?