Hi mama! Mix feeding babies do have different poop colors compared to purely breastfed babies, kaya yung dark green shade is normal, pero since she's 3 months na at may pagbabago na yung kulay at ang amoy ay medyo foul na, better to bring her sa pedia para ma-check lang, just to be sure walang issue sa digestion niya. A few of us din nag-observe ng color changes sa aming babies around that age, but pag may slight worry ka talaga, mas peace of mind na kung na-assess ng doctor, kaya go na para sa check-up!