Draconic Bloodline with Dragon Breath Feat

[Sudden Deinonychus]

Hello all,
Working with a kobold sorcerer who wants to take the draconic aspect and dragon breath feats, and is also a draconic bloodline sorcerer.
Question: What do I do about the two different types of breath weapons? You get a breath weapon at 9th level sorcerer, but also one with the dragon breath feat. The PC is a white kobold following along the path of a white dragon, so the energy type will be cold in either case, but when he hits 9th level sorcerer, what do I do?
Does he just use each breath weapon separately, or do the effects (damage, etc.) stack together?

Thanks for any input.

[Zarius]

They are separate pools of breadth weapons, line a cleric that takes necromancer levels. You don't DO anything about it, you just keep track of the separate pools and how much damage each type does.

[Sudden Deinonychus]

Thanks Zarius! That makes sense.