No need for wyvern milk!

Get a deadon in a pen. Turn on its auto heal.

Put hatchling in pen. The deadon will keep it alive bypassing the need for any wyvern milk.

Note: the hatchling you grow like this will not get full bonus at end like you do with wyvern milk.

But it dose save you a head ache. And critters..

More Wyvern Taming & KO Tips