Hey mama, normal yan! At 3 months, babies can still be all over the place with feeding amounts, some days 2oz lang, some days 3oz, kaya okay lang yan. Since she's gaining weight (5.2kg is good progress!), it sounds like she's getting enough kahit variable ang intake, pero if you're worried about her growth or if she seems hungry pa talaga after feeds, better check with her pedia just to be sure. A few of us mums sa circle were anxious din about this, tapos doc assured us na basta growing at normal ang diapers, we're doing fine, kaya don't stress too much!