Sitting Up All By Myself

It seems like things are happening so quickly with Anaiya's development.  One minute she is learning to roll over and the next she is sitting up by herself.  She is still getting used to sitting up for long periods of time.  We try to surround her with pillows that way when she falls, it's not so bad.  But she doesn't seem to mind because she just rolls over onto her belly and starts playing again with her toys.