You will have to train your eye.
Some will be leatherbacks, [ you can tell when you look closely ] some will be hypo, some trans., and some have the possibility of having all 3 morphs present, others will be het. for hypo + trans. They are either leatherback or they aren't, they will not be het. for L.B. I'm not sure how the Dunner gene comes into play as far as passing the gene along.
Begin offering a few crickets at a time on day 3. The babies will not be big eaters at first, so just chuck 6-7 crix in at a time, see what gets eaten, offer a few more. I shake the crix up a bit so they are slow + dizzy and the babies snap them up without the crix escaping under a branch or something else.