Formula Merlion

In an effort to gain weight, we tried her on formula for last feed. We gave her Similac Neosure as recommended by PD. it is a higher calorie milk formula for premmies and low weight babies.We trialed with day feed a few days back and she was fine. However when we swapped to night, she merlioned the whole feed or more in her sleep 2 h after. For 2 nights we had to clean up the big mess. Sometimes she would throw up till as if she gagged. Prayfully she is well.