My 4 weeks baby cries anytime she passes gas. Is this normal?

Linv

I have been breastfeeding and also doing formula since day one.

She has diaper rash and I changed her formula last week from similac pro advance to advance similac and that’s when I noticed this could be coincidence. She also started fussing when she’s getting bottle feeding. Is this normal in new borns and what can I do to help.