After about a month or so the kittens will start eating whatever
you're feeding to the momma.  I start seeing kittens after 5 weeks or
so from birth.  By then the kittens can come in by themselves, and
start taking over the house (they have to learn to jump up)!.  If
you're handling them already, they may not be so nervous and will be
into everything much sooner.

Most dry cat food is also for kittens.  They do LOVE Kitten Chow as it
has more fat content than regular dry food (the adults love it too)!

Good luck!

Saul Levy