at that age you should be able to feed seeds peanuts are fed as treats like candy don't feed young peanuts if you can feed them chicken laying pellets a pigeon that is full still will beg and act hungry water by dipping its beak in a small container that allows it to stick its beak in...
I have always feed layer pellets soaked in water or ground up and soaked in water with no problems and have fed a lot of them but did start them on the kaytee baby starter until they were about one week to ten days old
in pouters when a bird has sour crop or is just too full you put it in a cone or something to keep the crop up high so it feeds in to bird does your bird eyes blink a lot if so more water still say your best bet get layer pellets and feed get syringe and air hose for fish tank and force...
I feed them laying pellets at this age by putting in the mouth how much until crop is full let the bird dip it s beak in water to drink they catch on fast twice a day feeding would be enough but if you can feed more that great the crop should empty between feedings
first dip its beak in water and see if its thirsty pigeons suck water like horses cows people if you have bird seeds you can feed them that might have to open beak and feed that way keep warm and away from cats dogs and others that may want to play with it good luck they aren't that hard