Baby pigeon

Hello everyone,

I am after advise, we found 2 baby pigeons in the garden 2 days ago, unfortunately 1 died and we still have 1 which I am feeding. 

We did leave them for 24hrs to see if the parent returned but no signs of them. 

I've been giving it mushy dog biscuits via a syringe. From research it looks like he is about 10 days old so not picking food himself. He does cherp and flap his wings when I go to him so I assume he is ok. 

I'm I doing things right? Do I need to do anything else?