FORMULA MILK

what is the formula milk for baby? yung hindi nmn masyadong mahal at hindi rin masyadong mura,.yung trusted brand nyu na milk.? my baby boy turning 1yrs. next month I'm planning kasi na eh mix feed na cya.,for now pure breastfeeding cya from new born until now. sana po may suggest kayu na subok na nyu talaga salamat po. ?