Some disposable diapers can contain chlorine to whiten the diapers and clean the materials used to make them.
However some diapers use a different non chlorine process for whitening the diapers and making them.
Pampers and Huggies are two diaper brands that uses a non chlorine solution and process to make their disposable diapers.
So Huggies and Pampers diapers are both Chlorine free diaper brands so they are mostly chemical free.
Honest diapers are also Chlorine free and chemical free.
Some babies and toddlers may have an allergic reaction to some diapers and may break out with rashes so you might have to try different brands of diapers if your kid breaks out with a rash from certain brands of diapers.