A little more info would be good. How old is your hatchling...1 day, 10 days? Put one close to it in it's hide, see what it does. Slurry works great. Put a little weight on with the slurry, then try the mealworms again.
This is Marcia's (Golden Gate Geckos) recipe. It works really well to help keep weight on them. You put it on their mouth and they lick it off. It has helped us with some that had a slow start.