Female raised 3 babies, she fed them and now they can eat food by their own.
Yesterday i separate those 3 chicks from the cage as i had to introduce new male for her mom. (these chicks are old enough to live without their mom)
Bad thing is all these 3 chicks are very weak. Their feathers are also fluffy

Can anyone please tell me what food should i give them to make them stronger?
Usually the food which i give to my finches are millet, cuttle bone, egg shells.
Please tell me that what home made food should i give them. also note that here in my city its hard to get ready made food for finches which have minerals/vitamin etc etc.