What kind of babies are you talking about? Veiled babies can handle 1 week old crickets, but baby jacksons may go with pinheads or fruit flies.
Put a cup of fruit in the cage, and I am sure in a few days, you will have some natural fruit flies going into the cage.
Lancecham is correct, fruit in a cup in open air will produce fruitflies, in Hawaii as anywhere else! Greatlakes Hornworms.com has 1/2 inch Superworms that are cheap and last forever, they are a great baby Cham food.