you should stick to a certain feeding scedule, if you want to follow mine its . . .

babies/yearlings: offer food every 5-7 days
over 1 year old: offer food every 7-10 days

if they eat they eat if they dont then i offer them food the next scheduled time for them.

also before every offering of food i weigh them to keep track of growth rate and make sure they are not losing weight