Instant mommy?

Long story short, I ended up with my nieces for at least the weekend. They are 2 months and 13 months old. It's been so long since I cared for a baby that young, that I feel like I don't know anything. They are very sweet little girls, but I'm already exhausted and I've only had them for 6 hours. Both are sound asleep right now, and my sister said they usually only get up once in the night. I'm hoping the weather is good enough tomorrow that we can take them out and around with us.

I'm going to go crash and hope that I get at least a few hours of rest before they wake up.