My rescued 3-week old baby pigeon is not as active as it normally is. I have been hand feeding for about a week now with the LaFeber formula. I have been feeding it about 60ml throughout the day. About every 3 or 4 hours. Could I have overfed him? His crop was empty this morning and I fed him about 20ml of the formula. He hasn't had much energy all day and is not chirping as much today. His droppings are light green with some white in them and kinda runny, not as solid as they were before. Please help me make him better. Thank you.