I'm actually doing that right now and is going great! He tries to get the breast milk before the formula but I think it's cause he knows it's better for him. But yeah I switch every feeding.

It was hell. The formula we was on made my son so constipated the breast milk didn't help much because he was a big water so we had to change his formula until we found the right one. He was breast fed for only 2 months unfortunately before my milk dried up. Now he a big pooper 😂😂😂😂