Cooper didn't get to work on his crawling a lot while we were gone on vacation. He was stuck with us holding him or in a stroller most of the time. So the minute we got home and set him down in the living room, he just took off crawling! It was like he was saying "finally someone put me down! I'm ready to go!"
And he's been on the go ever since. I forgot how quickly they can move when they finally figure it out and he's into everything. We have to make sure all of Connor and Chloe's little toys are picked up and out of reach. That's something I didn't have to worry about when the twins were starting to crawl. We also gated the whole living room up with the twins and I really don't want to do that this time around.