Kitten's eyes are opening at 9 days old

Here is baby #2 born on April 3rd. Now 9 days old. One eye has opened and the other is half open. All the other kittens eyes are still closed. The first two kittens are growing quickly and this one squeals very loudly when Aurora (Mom cat) is out of the box.

Aurora's babies are about four days old today

The top picture shows how the babies curl up with each other when their mom steps out of the box to eat and get a drink of water. They curl up and stay that way until Mom returns. As soon as she steps into the box, they squeal like crazy.