4 babies 7 days later their hurt and in danger fo dying

[julywandy]

4 babies finally
but 7 days later they are very hurt and in danger.

my kiwi had 4 beautiful babies, for her first time.
I took a pic. of them I was so happy and 7 days later after seeing them for the first time I notice kiwi, nana and rainbow( all adult love birds) had blood on their peak and I was so sad I imagin they had killed all the babies.
so I checked on them and for my surprise they were alive but not well.
so I rushed to the pet store and the person that check on them said they are very weak but that if I can handle all 4 to look over they may have a chance to servive. so i'm giving it a try and maybe with some advice from all of you I can make it. please help me with some advice i'd appriciate it...:sad
: why whould the adults hurt them this way?...