Reactions to washing detergents are very rare, even in those with sensitive skin and eczema. Studies of people with allergic contact dermatitis show no reaction to laundry products in nearly 100% of cases. 
If your baby wears clothes washed in normal detergent without issue, their nappies can be washed in the same detergent. If an all over body skin reaction occurs ensure you get a diagnosis for skin conditions and comprehensive allergy testing by a medical practitioner or specialist. If nappy rash occurs visit the GP for diagnosis.
For more information on what is in detergents and the function of the raw materials see our information on Mainstream Detergents, Fragrance in Detergent, Enzymes, Optical Brighteners and Plant based, Sensitive & “Eco” Detergents, and the WashWise information sheet on Laundry Detergent Ingredients.
The Royal Children’s Hospital (RCH) Melbourne has fantastic eczema resources. This includes:
- assessing eczema
- everyday management
- minimising common eczema flare triggers
- managing eczema flares
- managing eczematous skin infections
- downloads and information for parents
- topical skin treatments
- National Library of Medicine, Allergic contact dermatitis to detergents: a multicenter study to assess prevalence <https://www.ncbi.nlm.nih.gov/pubmed/11807430>.
- Medscape, Enzymes, Detergents and Skin: Facts and Fantasies <http://www.medscape.com/viewarticle/575890>.
- Royal Children's Hospital Melbourne, Clinical Practice Guidelines > Eczema (May 3, 2021) <https://www.rch.org.au/clinicalguide/guideline_index/eczema/>.