Yeah under 200g use rat pups, but hel probably switch soon after that again . At 200g I had to switch to weaned rats because my girl would still be hungry after eating one rat pup. Scary to see her stretch out that much to swallow it though but she took it like a champ. Charts recommend switching to weaned rats at 400-500g mark though but idk if that's accurate for all Bp's since some are ggirthy enough to take it at 200g mark. But I could tell my Bp needed o be upped since there was no bulge at all after eating a rat pup and she didn't defacate since she wasn't filling up.