Breastmilk/ formula issue?

My baby is 6 days old, we’ve been feeding her a combination of breast milk and formula. I’ve noticed that after she has breastmilk she’ll spit up (small amount) and/or get hiccups. Is it possible that my breastmilk is upsetting her stomach or is it normal to spit up a small amount with breastmilk? She holds formula down just fine with no spit ups almost ever.

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