Stomachache in Newborns

No

My baby is 5 days old and she’s constantly crying in pain. She has diarrhea as well.

I’m giving her both breast and formula.

I’m confused if it’s because of my breastmilk or the formula .

This is my 2nd baby but I didn’t feed my first one.

I really wanted to feed this one but the way she’s screaming and crying in pain and her stomach all hard, makes me feel like she’s better off on formula.

I don’t wanna be the reason of her pain

But I’m confused because I haven’t been eating anything unhealthy since I have birth to her, what can I do? 😓