Advice please!!!!

My 5 month old is on the gerber soothe formula. She has recently (past month) been spitting up excessively. Every time we burp her (she eats 6 oz. & I burp her 3-4 times a feeding) she spits up a lot. I’ve tried doing the cereal for it to stick to her stomach better but she then gets constipated. Should I ask about switching formulas? Sitting up after don’t make a difference because she’s spitting up when we’re burping her throughout the bottle. (& I really don’t feel like hearing the don’t put cereal in a bottle bc I know the risks & I know not to make it thick.)