Hi, I'm a newbie to this hobby but just a few days ago I got my baby girl to eat her first rat pup. She is 165g and the rat was 22g. What I did was make her wait 2wks for a feeding then I placed the rat pup inside a bag with a medium sized mouse (both frozen). I heated a cup of water in the microwave for 3 minutes which brought it to boiling. I placed the bag in the water and let them sit there until the water was almost cool. Then I rolled them around in the bag making sure that there was plenty of mouse smell on the rat pup. I offered the rat first and she hit it like a champ. Mind you I've been trying for a long time to switch her over and I was beginning to think she would never eat rats. This worked for me. Good luck