When baby has many different child care providers, she may have a hard time forming close bonds. She needs a provider who will care for her needs quickly and sensitively, someone she will learn to trust. So try to find a provider who enjoys your baby and will be available regularly. Baby will adjust. But try to limit the changes.
Children can be very different from each other.
Then you can encourage each new ability. I sometimes sit up for several minutes. I creep backwards and forwards, with my stomach on the floor. I hold onto an object with one hand, and then put it in the other hand. I hold one building block, reach for a second one, and look for a third one right away.