Oo momsh, normal lang yan! A few of us tried Nan Optipro Two and ang dami talaga ng bubbles lalo na kapag mainit ang tubig or kung mabilis mo itong istir, one of my mum friends swears na kailangan mo i-let it sit for a few minutes para mag-settle ang bubbles before giving it to baby. Try mo ring gumamit ng slightly cooler water or stir it gently instead of vigorously, that helped lessen the bubbles namin.