Air Bubble In Crop

My budgie was born 3 days ago. I use a syringe to feed it. There is an air bubble in its crop since 2 days ago. It seems getting bigger since last night. I fed it every 2-3 hours for about 0.2-0.4ml each feeding. Would you please let me know how to help release the bubble? The photo 0219 was from yesterday. The rest of the photos are from today after feeding. 

Thank you!