Baby leos will usually eat a lot. Depending on the size of the crickets he might even eat up to 15 or so. What some breeders will do (and I've done a couple times with adults, just because I hate dealing with crickets) is put the babies (one at a time of course) in a tub/enclosure without decorations that has dozens of loose crickets in there. The gecko is left in there for about 15 minutes to catch as many crickets as it can. That has the benefit of the gecko eating what it needs, the crickets aren't in the enclosure (which can harm the gecko), and it's a lot simpler to deal with the crickets since they are all only in one area. The gecko should be observed to make sure it's able to catch and eat them and if it doesn't catch enough or it looks like it's still hunting, additional crickets can be fed normally.