It would be improper feeding. Why? Because when they are still "babies", you can't feed them foods that are hard, since they are still developing.
Most of the time they should be fed, blood worms, brine shrimp, plankton that has been presoaked to soften it up. Feeders can cause problems too, if they are diseased and such.
Most people don't quarantine the feeders for 2 weeks to make sure there is no outbreak of disease, which is another cause of death for the aro.
Harder foods, prawn, krill etc..should be fed when the aro is big enough..lets say 4-6" or so.
Another factor is when people buy the aro with the sac, they try to feed it. DON'T. Let the sac get absorbed on its own, which will provide nutrients for the baby aro, after its gone then start feeding the softer foods.
Just think of the baby aro as a human baby...at that early stage its critcal to take care of them, if you don't you know the outcome.
