Feed your baby fish a few drops of infusoria, a liquid fry food, from an eyedropper several times a day after they have just hatched. Infusoria is small enough that your baby fish will be able to eat it. Crush up some flake food into a powder if you do not have any other options for fry food. To administer the food, dip the end of a toothpick in water then dip it into the powder.