Formula for gassy baby

My baby is 16 days old and I was exclusively breastfeeding her until 3 days ago. I found out I am not producing enough milk and even with power pumping I'm still not getting quite enough for her. I have been supplementing just 1 bottle a day with enfamil A+ and after giving it to her she is sooo angry and gassy. She just screams and kicks and squirms and is so uncomfortable :( I know it's only been a few days and babies tummies are sensitive. Is this normal and it just takes time to adjust to the formula? If so how long? Or should I try a different formula?