Combination feeding

lilmamabat

So I tried to exclusively breastfeed, but due to latching and supply issues went directly to pumping and supplementing with formula. We figured out that dairy is a no-go, but now I've noticed something strange. Too much formula=tummy ache. Too much breastmilk=tummy ache. It seems mixing a bottle that is 2 parts breastmilk, 1 part formula is the magic potion for a happy tummy. Does this make sense? Has anyone else experienced this? Also formula is soy and I'm avoiding dairy, so that's not an issue.
I don't know anyone who has done combination feeding so it's all been an experiment and googling.

knottieffb439001550b83c

My baby is also being supplemented with formula. He has had two bigger spit-ups and we’ve supplemented since day 2 of birth (our pediatrician advised us to supplement with formula because formula provides more hydration). He’s on similac 360 total care sensitive and I think he’s tolerating it decently. The formula is dairy based. Our pediatrician did tell me to avoid eating too much dairy and cruciferous vegetables to prevent those things being absorbed into the breast milk (I had no idea if she didn’t tell me).