Kittens under 8 weeks need care from their mom. Anytime
you find kittens alone, wait and observe to see if she returns
for them - most times she does. When kittens are truly
abandoned, caring for them is a quite important.
Alley Cat
Allies has extensive information on caring for
neonatal kittens,
in the event you have kittens you need to care for yourself.
Listed on their site is basic tips, useful items needed in
caring for your kittens, correct way to bottle-feed neonatal
kittens. An online store for video information "Feline
Neonatal Care", book Bottlekatz by Sharon Darrow, and
other materials for learning techniques.
Information on
kitten
progression to determine kittens' age and understand the
stages of their development.