Sleepy baby

Grayson has been falling asleep during feedings. We've done everything possible to keep her awake so that she can finish her bottle. We tickle her feet, pinch her cheeks, and rub her head and belly......but nothing seems to work. Several days ago, we decided to strip her down to her socks and diaper. Being naked kept her awake for a while, but as you can see from the picture above, she STILL fell asleep.....