I recently had to take care of unweaned baby cockatiel, about 21 days old. I fed it Harrison’s formula and made sure the temperature was correct and everything. The chick’s crop hasn’t fully emptied in about 15 hours, even though it’s droppings are normal. I just gave it three drops of acv in warm water and massaged the crop for a few minutes but it still hasn’t gone down. I won’t be able to see a vet for a couple of hours so is there anything else I can do to relieve the crop? And should I change the formula?