Are you referring to this passage?

Offspring was not reared at the will of the father, but was taken and carried by him to a place called Lesche, where the elders of the tribes officially examined the infant, and if it was well-built and sturdy, they ordered the father to rear it, and assigned it one of the nine thousand lots of land; but if it was ill-born and deformed, they sent it to the so-called Apothetai, a chasm-like place at the foot of Mount Taygetos, in the conviction that the life of that which nature had not well equipped at the very beginning for health and strength, was of no advantage either to itself or the state. On the same principle, the women used to bathe their new-born babes not with water, but with wine, thus making a sort of test of their constitutions. For it is said that epileptic and sickly infants are thrown into convulsions by the strong wine and loose their senses, while the healthy ones are rather tempered by it, like steel, and given a firm habit of body.

The correct way to cite this is: Plutarch, Life of Lycurgus 16.1-2 (or Plut. Lyc. 16.1-2).

And may the gods strike down anyone who writes his references like that online article does! May I suggest picking up some more academic works on the subject? A great starting point on Sparta is Nigel Kennell's Sparta: A New History (2010).