There are specific differences in how you feed an Oscar fish depending on its stage of development. For instance, babies are greedy eaters, and you should make sure that they have enough food to go around. However, there is a temptation to overfeed them since the babies always beg for food.
The usual rule of thumb applied is to feed your fish as much as they can eat within 3 minutes. For babies, that might not look like it’s enough, but they might try to eat food that is too large for them, and that will cause issues as they would not be able to swallow it.
Feed the young several times a day, and then decrease the number as the Oscars grow. Once they hit 5 inches in length, you can reduce the number to 3 times a day. For even larger fish, such as 8 inches or more in length, 2 times and even just one time is more than enough.