I first got my first Dr.brown in the hospital and i loved it but the nurses also recommended then M to help with a fussy baby. It helps to prevent as much gas. The olny CON u can think of is that there is more pieces than a "normal " bottle. As un normal i mean it has two extra peices:)
I used this when my son got out of the NICU. It has more calories which helped him gain weight. He was 4 pounds when he was born and was haing trouble gaining. I am very thankful he gained enough to witch to the regular formula!! He us doing amazing, thank you!!