Horrible stinky pee

[LindsayK]

I've been CDing my new DS for the past 4 months, and just decided to switch over my DD pre-schooler who is daytime potty learned to cloth as well. I just bought the next size up prefolds for DS, and got a few toddler sized prefolds for my DD as well. She loves her new "flower diapers" as she calls them (I got a cute flowered cover for her)

BUT

She has HORRIBLE smelling pee!!! I thought before that it was the smell of the disposables she was wearing, but now that she's in cloth, I can tell its her pee. I prepped and have been washing both of the kids diapers together, and DS diapers don't smell at all, so I don't think its not a diaper issue, rather what's going into the diapers. I never had diaper pail smell before, but now when you open the pail you about get knocked over by nasty odor and ammonia smell. Its just awful :(

What could be causing this? Since I don't think its a diaper issue, this might not exactly belong in the diapering forum, but I am sorely tempted to go back to sposies with DD because even though it still stinks, at least I can get rid of the smell quickly by getting rid of the diaper.  

I think she gets enough water to drink. She takes a Whole Foods brand kids multi vitamin, and due to allergies is on Zyrtec and sometimes Benadryl. Other than that, she eats a fairly balanced diet. Is there anything I can add/take away from her diet to change things?

Barring being able to change the smell of her pee, any advice about how to mitigate or manage the smell?

[bluebackpacks]

I have read that Zyrtec can cause foul-smelling urine.  I don't have a source handy, though.

[Marsupialmom]

Some multivit make my urine stink.  

[goldenwillow]

I agree with the supplements adding to the stinky pee, however, I know that while teething, DS's pee really stinks.  Have had multiple folks say the same while teething... for some reason all boys.

If your diapers are stripped and no issues there, possibly the supps or pee.