In the wild, baby finches are fed regurgitated insects by their mothers. According to Bird Channel, hand-reared baby finches are fed a strict diet of an electrolyte formula and commercial hand-rearing baby bird mix.
Freshly hatched finches should be fed only one small drop of electrolyte formula every two hours for six hours. After the initial electrolyte feedings, the bird can be introduced to a thin mix of commercial hand-rearing baby bird mix every two hours. The bird should not be fed between 11:00 p.m. and 6:00 a.m. On the seventh day, the feedings should be spaced out to every 3.5 hours. Only experienced bird keepers should attempt to hand-rear a baby bird, as they are very fragile.