I'm guessing you've bought this bird from a breeder? If possible take them back to be weaned, hand feeding is in short DANGEROUS and you need to be extremely clued up on how to do it otherwise you can inadvertently kill the chick
what temp is the food? Is their crop emptying between feeds? Are they gaining weight? Have you got a brooder? Are you spoon feeding or using a syringe? Is the syringe the same style as the breeders? Are you warming the syringe before offering feeding? Are they 100% eating the food or is it going in the lungs?
You get the gist of how much of an undertaking hand-feeding is just from that alone and there are hundreds more things that can go wrong which is why I say it will be better to bring them back to the breeder and make them finish weaning the chick. They won't bond any less to you so if they try to feed you that don't take it