Don't worry, normal lang yan especially sa mixed feeding kasi ang breast milk talaga ay mas mabilis ma-absorb ng baby's body kaya sometimes 1-2 days lang between poops, basta soft pa rin ang poop when it comes out, that's the key sign na okay lang siya! A few of us moms have the same setup, mostly formula pero mostly breastfed pa rin, at ganyan din ang pattern ng babies namin, kaya alam ko yan haha. Since ang tiyan niya ay soft pa rin at ang poop ay hindi matigas, sounds like baby is digesting well, pero if you're still feeling anxious or notice signs like baby seems uncomfortable or bloated, best to mention it sa pedia mo on your next visit para peace of mind, doctors always appreciate these questions!