Mommies with older kids!

I feel like, since this is my first pregnancy and I haven't even had my baby yet, I'm seeing this rose colored vision of baby days. However, I've taken care of enough babies in my life to know that they grow up SO fast! I just can't even begin to imagine my life with an older kid! 
Anyone have experiences to share? I'm so excited to be a Mom but it feels so surreal.