Oo normal yan, mama! Mix fed babies usually have softer, slightly acidic poops compared sa purely formula-fed babies, kaya medyo maasim talaga, especially if may breastmilk pa siya. A few of us sa mum group have mix fed babies din and lahat naman ganyan, pero kung may ibang signs like rashes, constipation, or unusual color, mas better to check with your pedia para peace of mind lang.