Hi there....try a bit of baby food squash, applesauce or canned pumpkin, and you can add a drop of olive oil to any combination of those. If you keep him on any sand or wood chips, get rid of it [ it can cause impaction ] and use paper towels. When you soak him/her, make the water just a bit warmer than usual, but not TOO warm. Be sure that the insects you are feeding him are no longer than the space between his eyes....this is VERY important for tiny babies. As they get older, that rule can be bent a little, but it's crucial with babies. Do you have a pic of his set up, including lights ? That mat be helpful here. Hopefully he'll go for you soon.