Baby odors and diaper rash are usually caused by residual urine that remains in clothing and diapers that were not fully washed. There are typically three signs of urine residue:
In the body, ammonia is converted to urea and excreted. Once the urine is release, the urea begins converting back to ammonia, so a little bit of ammonia smell is normal. Now, residual urea and certain bacteria and enzymes increase the production of ammonia. So if there’s a strong ammonia odor after your baby urinates, that’s because of the residue in your diaper.
Borax helps stop the enzymes that increase ammonia production, and naturally prevents that ammonia odor from being created from your baby clothes, bedding, sleepwear, and diapers. All you have to do is add ½ cup of borax to the wash at the same time as your detergent, and you’re good to go.
You can also pre-treat heavily soiled items by soaking them in a borax solution that consists of hot water (about a gallon), and a half cup of borax. Be sure to soak the fabrics for at least an hour before washing.