Can 1 /0.5 Oz. Of Enfalac A+ Or S26 Gold Be Added In Infanr's Food Who Is Also Breastfed? Would You Recommend Other Milk Formula?

Good day doctors! My son is 2 months old as of now. and I'm doing breastfeeding and a formula because I'm a working mom. Enfalac A+ is I guess not good to my son. He poop for almost every 2-4 days, his stool has some liquid like I guess its a water and its color is dark yellow. While, in s26 gold he poop every day,his stool is good and light yellow. but the problem is its too sticky, everytime he drinks it he has something in his throat like a phlegm or a phlegm sound. I just want to know if I could add an additional 1 or 1/2 oz. in his feedings. I don't like a any other milk formulas because upon my researches, these 2 are the best milk, but if you'll recommend I'll really try it. Thank you so much! Your answer is really a big help.