Also, make sure you're not exposing a snake you've had to a new snake who hasn't completed a minimum three month quarantine.
And- I get a little nervous putting babies next to adults- you never know if the adult might want a little snack. It's never happened to me, but I'm always on guard for it, and I only do it for the rare parent/offspring photo.
And- if you have a male and female, or two unknown- they are never too young to mate- and it only takes an instant for them to lock up.