Hey mama! Totally understand the worry, poop color changes are SO confusing sa simula! Actually, sa mixed feeding, it's super normal for baby poop to vary between mustard yellow and sometimes a bit more tan or greenish, especially kung may formula na involved. As long as it's soft and hindi clay-white or super pale, you're usually good. A few of my mum friends noticed their babies' poop shifted around the 2-month mark too, kahit nag-adjust lang ng feeding amounts or timing, it can change. The texture matters more than perfect mustard color, honestly, soft is the goal, not how it looks. That said, since this is your first baby and you're still getting the hang of things, totally worth a quick check-in with your pedia just para peace of mind. They can reassure you right away, lalo na if it continues to look off to you! You're doing great, mommy!