Congrats! One looks like a partridge (the chipmunk), and two have white on top of their heads. That can mean barring, and in some cases sex depending on breed.
Whatever they are, they're adorable!
As long as they don't have wind and you can maintain the temperature for them for the age they are.
This is merely a guide. I am sometimes able to cut heat at 3 weeks, sometimes it's 6 weeks. Each batch is different for some reason.
