Ay, normal lang yan, mama! Mix feed babies usually have poop na parang peanut butter, thick, pasty, and can be anywhere from yellowish-brown to brown-green, so kung ganyan ang texture at color ng LO mo, walang alalahanin. A few of us tried mix feeding din, and honestly ang gising namin is na mas malalaki ang output and mas malakas ang amoy compared sa pure breastfed, pero yan talaga ang expected with formula. As long as hindi siya constipated or may diarrhea, at regular ang bowel movements niya, you're good! Pero kung biglang nag-change ang color, frequency, or laging loose or hard, worth checking with her pedia lang para sure, especially at 21 months na.