How old is the baby? What are you feeding it? Why do you think that you overfed him? There are lots of reasons why his crop could not be emptying. For one, if he is very young, then he needs supplemental heat to keep him warm enough to be able to digest his food. If not kept warm enough, they can't digest it and it will just sit in the crop and sour.
Another cause could be sour crop that could be caused by yeast or a blockage from canker.
Could be many things, so need to know what, how much, and how often you are feeding him. Also, how are you feeding? You only feed after the crop has emptied from the last feeding. You don't feed again when there is still food in the crop.

 

How old is the baby? What are you feeding it? Why do you think that you overfed him? There are lots of reasons why his crop could not be emptying. For one, if he is very young, then he needs supplemental heat to keep him warm enough to be able to digest his food. If not kept warm enough, they can't digest it and it will just sit in the crop and sour.
Another cause could be sour crop that could be caused by yeast or a blockage from canker.
Could be many things, so need to know what,
how much, and how often you are feeding him. Also, how are you feeding? You only feed after the crop has emptied from the last feeding. You don't feed again when there is still food in the crop.

The baby is about 2weeks old and have been feeding it blended green grams mixed with rice and broken wheat. I keep it in the artic which is very warm but I may have over feed it due to it's constant pecking, I thought it needs more food..

 

Here we would mix warmed baby applesauce with a small amount of warm water, and feed that. It should help to get things moving. But don't know what you have there. Do you have apple cider vinegar? Need to be careful when feeding not to give too much. Feel the crop and fill it 2/3 full. Do not feed again until it empties. Make sure food is warm, but not hot.
How is the baby today?