Diaper Rash from Swim Diaper???

It definately could be from sitting in a wet swim diaper and/or in the water all day. My son got a rash between his legs from the swim diaper and swim trunks, to much moisture.

You say he eats clementines all the time, my kids love them too. My guess is they aren't causing it. You didn't say how often he eats watermelon. Watermelon can cause serious diarrea in little ones. I gave it to our son at about 1 yr, just a little, that was his first #2 blow out since he was a couple months. I waited a good year after that and it wasn't as bad. They eventually will grow out of it but it could take a year or two before it doesn't give him diarrea.

It very well could be a combo of watermelon and a long time in a wet swim diaper. Rather than vasaline, try Aquaphor. It has always worked great on our kids.

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Is he teething? Whenever my son teeths, he gets diaper rash. And if the diaper isn't changed RIGHT after a BM, he can even get the sores. After trying various creams, a friend said that her doctor told her to just use neosporin. So, we use the butt paste on most of it, and the neosporin on the sores.

As far as swim diapers, most diapers have chemicals in them, and you then have the chlorine in addition to that. Have you tried washable swim diapers?

Just a thought...

Could he be allergic to watermelon? Or could the reaction be from the watermelon?

Moisture is a cause of diaper rash, so it could be the swim diapers. To treat it I would recommend diaper rash cream like Balmex.

It could be from the diaper, it could also be from the watermelon-has he eaten it before? I do remember my son getting a slight rash around his legs from the swim diapers. They make cloth swim diapers and if the pool allows them you might be better off. (Check with the pool though as some want disposables instead of cloth) or maybe try the Pampers brand, I know a lot of people don't like them as well as the Huggies though.
Also to help heal the rash try an oatmeal bath (I personally like CVS's brand better than the Aveeno-it's by the bubble bath & stuff). Just let him soak and play, don't use soap, the oatmeal draws dirt & acid away from the area and soap could aggravate the soreness. Let his booty air dry, then apply a heavy layer of vaseline or Aquaphor & a layer of butt cream over that. It's my surefire cure thanks to our pediatrician's nurse.

Yep, it happened with my first son at the beach and he got it sooo bad. I had to change the swim diaper every 2 hours if not more and put on diaper cream after each changing. I thought it was a combination of the salt water and fruit. Butt paste should not burn, but the bum is sensitive so I would just recommend changing them often and using whatever cream or vaseline relieves the burn.

Our kids have had issues with diaper rash on and off while being in diapers. Our daughter just turned 2 and still wears diapers. Our son was finally potty-trained after his 3rd birthday.

The food they eat can affect their bottoms when they poop. Whenever our kids have something really acidic (in conjunction with diarrhea), they always get bad diaper rash.

Unfortunately, there are so many things that can cause diaper rashes (fungal/bacterial infections, allergies, etc). It's possible he's allergic to something in the swim diaper.

If it continues to get worse, you can have your pediatrician write a prescription for a compounded Rx diaper rash cream that combines an anti-fungal, antibiotic, antihistamine and anti-inflammatory. Around here it's called "Riley Butt Cream", and it's great when the rash gets really, really, really bad.

He may be allergic to the chemicals in the diaper or the chlorine from the pool. I would switch to a cloth swim diaper and make sure he is thoroughly bathed after swimming to remove the chlorine from his skin.

It could be food as well, so I wouldn't rule that out. Some children have immediate reactions to foods, and sometimes over-eating certain foods can actually create an allergy to them. I did this with my first daughter. She loved canteloupe and ate it everyday for nearly a month and then started getting horrible blisters when peeing. We cut out the canteloupe and they went away. Returning whenever someone gave her some. We kept it out of her diet for over a year and when we reintroduced it she was fine as long as it was in moderation. So it may have been a pH balance issue with the food.

They make cloth swim diapers which likely won't bother him as much. Like another poster said, disposable swim diapers are made differently, so it's probably what's causing the rash.
Let him go without a diaper at home if you can. That will help with the rash, especially if the diaper cream is hurting. IF it gets really bad though, take him to the doctor to get a prescription.
Hope that helps.