Hi Katie, I know they reach adult hood in 1-2 years and they are on average 10cm but have been known to get to 15cm. As for feeding I'm not sure as unfortunately I don't own one. I do know that you have to watch their weight as they do tend to get over weight, but as your wee Darlings (Herbie & Pip) are so young, I imagine won't have to worry about that for now as they are growing.I know with my frogs that a variety in their food is good for them. It's fun watching them eat, you aren't alone when you say you get up in the night to watch them.