Since you got it from the TP it could have detergent build up. Even though you washed it the same as your other diapers if its got a lot of build up that wont come out unless you strip it.
You can try stripping it but since its just one diaper seems like a pain and a lot of water - another option would be to boil it for a bit. I have never boiled diapers so I dont know how long you do it for or the details but I am sure someone else could give you instructions.
If you want to try stripping it - just set your washer to the lowest setting and do HOT (as hot as you can get your water) rinses. You can start by adding a bit of baking soda to the first rinse and then some vinegar to the next. Just keep doing rinses til there are no more suds.
We use only SOS at night and Maxi used to be a pretty heavy wetter at night. We never had trouble w/ rashes and if you havent had rash trouble before my best guess would be that its got build up from the previous owner.
Good luck!
You can try stripping it but since its just one diaper seems like a pain and a lot of water - another option would be to boil it for a bit. I have never boiled diapers so I dont know how long you do it for or the details but I am sure someone else could give you instructions.
If you want to try stripping it - just set your washer to the lowest setting and do HOT (as hot as you can get your water) rinses. You can start by adding a bit of baking soda to the first rinse and then some vinegar to the next. Just keep doing rinses til there are no more suds.
We use only SOS at night and Maxi used to be a pretty heavy wetter at night. We never had trouble w/ rashes and if you havent had rash trouble before my best guess would be that its got build up from the previous owner.
Good luck!