Nan vs similac or other formula. What do you mummies look for in the formula?

It is subjective to each baby. There is no good brand I feel. You have to try and see if your baby takes well to it. For my gal she was on enfamil for first 10 months but I felt her phlegm was too much and when she went to enfamil 2 she has very bad constipation. I recently switched her to nan and she seems to be taking it better. She poops more often.