I adopted a preggers kitty who presented me with four babies the day after she moved in. Chelsea (mom cat) was so young that she was sort of clueless...a baby having babies in a way. Lucky for me she went right into the box I had prepared. The first two kittens were born within about a minute of each other and Chelsea was so exhausted she just laid there. I toweled off each baby, got each of them to mewl and stuck them to a nipple. Babies were good. Chelsea finally roused herself enough to start licking and cleaning herself. I kid you not - she "accidently" licked a baby and it was like the light went on in her head and she was all momma cat after that. She birthed two more kittens all by herself and all was well.
I had done some research online about birthing kittens so I was ready...lots of info out there. That's how I learned that two kittens being born really close together could be an issue. Just be on hand with lots of soft towels but don't be surprised if your momma cat does just fine all by herself.