My SO always buys LO's diapers and the brands that we have always used is Huggies or LUVS. DS has never had a diaper rash or any issues with these brands. Last week, SO walked in with Pampers Overnight diapers and literally a day later, DS was screaming out in pain and reaching for his penis and started developing fevers. I brought him to the ER on base and they mis-diagnosed him, saying that he had a stomach bug and prescribed medication for him. Two days later and he wasn't getting better, he was getting progressively worse. He couldn't go to Daycare all week because he had fevers as high as 104 degrees. I brought him back to the ER and they took a urine sample. His urine was cloudy and had puss in it. The doctor informed me that he had a bladder infection that may ahve spread to his kidneys (hence the fevers), and that bacteria called Staph was growing in his urine. He was hospitalized for two nights and 3 days and after running a test on his diaper, realized that there is acid in the brand PAMPERS, that DS is allergic to. I wanted to share my story with everyone, feel free to ask any questions.

Re: PAMPERS! My son was hospitalized
5 DIUI - BFN
IVF#1 - BFP - AJ 7/12
FET#1 - BFP Due 7/24/14
I hope your LO is feeling much better soon!
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According to the specialist, the swelling of the pamper that holds in all of that urine in as he's sleeping overnight is what caused the infection. Not trying to convince you, just passing along what an actual doctor said.
Which is exactly why I said that there's acid in the diapers that DS is allergic to- I specifically said him, not every kid. Thanks.
I saw it, too. Whatever it was, it looked terrible. Poor kid.
I hope your LO is recovering fast!