chicks are die after 3 days

Hi to all people in beautyofbirds i have problem and it's for 3 years :( when the chicks are born after 3 days , instead of getting fat and grow , they are losing fat and going to be thin and the mother not feeding them ! i give them food with finger but , any way after a few days they are die is there anybody here who can help me or tell my what reasons can be cause of this problem ? Thank you