Should I keep a close eye on this?

[B.O.S Reptiles]

Well, assuming an adult mouse is 30g (which I'm not 100% sure of) then I'd say it's time to switch to weaned rats. After 3-4 weaned rats you can start to feed smalls. This is for your BP, I'm not 100% sure about the other species. It may look like your 300g'ish BP is going to explode when you feed it a small.. don't worry, it won't. Feed it a small, then skip a week, then feed a small, then skip a week. After that you can feed smalls every Thursday again.

This isn't a rule - this is what I would do.

Cool! I've been excited to start feeding him rats for awhile (for some random, unknown reason) The pet store likes to guilt trip me when I buy rats and mice as feeders... Kind of annoying, and makes me feel guilty :/ they're always like "ohh, they're so young. But food is food" and I'm like