Infant diaper rash: the essentials
Infant diaper rash is irritation of the skin in the diaper area caused by prolonged contact with urine and stool beneath the diaper. According to the French national health insurance, it occurs mainly between 6 and 12 months, but can appear as early as the third week of life. It generally clears up within a few days with appropriate hygiene care and a protective cream. However, certain signs require prompt medical attention.
This article draws on the guidance published by the French national health insurance, the conclusions of a literature review published in Pediatric Dermatology, and the current state of public assessments of the chemical substances used in diapers.
How can you recognize diaper rash?
Doctors also call it diaper dermatitis. The French national health insurance describes its typical appearance: bright-red buttocks, with redness forming a “W”. It covers the inner thighs, buttocks, and pubic area.
The irritation develops in several stages when it is not treated:
- dry redness at first;
- then oozing skin dotted with small raised bumps, called papules;
- finally, raw, painful skin, sometimes with cracks or ulcerations.
The redness may spread to the lower abdomen and into the folds. A baby who cries during diaper changes or when the diaper area is cleaned often indicates that the skin is already sore.
When candidiasis develops
Without treatment, irritated skin may be colonized by a fungus, Candida albicans. The French national health insurance then describes bright-red, cracked folds covered with a whitish coating, sometimes with small pustules. This infection can also affect the mouth as thrush, recognizable by white patches.
Identified causes of diaper rash in infants
The skin in the diaper area is exposed to a warm, damp, enclosed environment beneath the diaper. According to the French national health insurance, several factors, often combined, weaken it:
- prolonged contact with urine, whose ammonia irritates the skin;
- stool, especially when acidic, particularly in cases of diarrhea;
- friction from the diaper and insufficient absorption;
- diapers changed too infrequently, which maintain heat, moisture, and maceration;
- irritating hygiene products, or incomplete cleaning of the diaper area.
The review by Blume-Peytavi and co-authors, published in 2014 in Pediatric Dermatology, places the peak frequency between 9 and 12 months. It classifies this dermatitis among the most common skin conditions in newborns and infants.
What care does the French national health insurance recommend?
Care begins with proper diaper hygiene. The French national health insurance guidelines are precise.
Change frequently
Change the diaper frequently, at least six times a day and after every bowel movement. Frequency matters even more during an episode of diarrhea. Wash your hands before and after every diaper change.
Clean, rinse, dry
- Clean the diaper area with a fragrance-free, soap-free cleanser, a syndet, and a washcloth or clean cotton pads at every diaper change.
- Rinse thoroughly.
- For a baby girl, clean from front to back to avoid bringing stool toward the vulva.
- For a baby boy, clean the folds around the genitals thoroughly.
- Pat dry without rubbing, paying particular attention to the folds.
The choice of cleanser also matters. We compared the options in our article which baby soap to choose.
Protect and let it breathe
Apply a copper- or zinc-based healing cream at least once a day, preferably before bedtime. A water paste or an oleocalcareous liniment is also suitable, according to Assurance Maladie. When possible, leave the baby's bottom uncovered during naps. Avoid diapers, pants and bodysuits that are too tight, as they increase friction.
During an episode, Assurance Maladie recommends a daily bath, followed by careful drying. Outside these periods, two to three baths per week are sufficient before one year of age, as we explain in our guide to safe baby bathing.
Products to avoid on red buttocks
Several common products can worsen irritation. Assurance Maladie advises against:
- talcum powder, whose fine particles can be inhaled and reach the lungs;
- scented or alcohol-containing toiletry products;
- wipes, whose use should be limited;
- plastic pants over the diaper;
- creams containing boric acid, camphor, phenol or methyl salicylate;
- benzoin tincture-based preparations and essential oil liniments.
Wipes or a washcloth and water: what does the research say?
On this point, the sources do not say exactly the same thing. Assurance Maladie recommends limiting wipes. The 2014 review concludes that cleaning with wipes or with water and a washcloth has comparable effects on the skin under the diaper. The same authors emphasize that no isolated care practice has been shown to prevent diaper rash. They call for more rigorous clinical trials.
In practice, a washcloth, water and a rinsed syndet remain the simplest solution at home. An unscented, alcohol-free wipe can help when you're out.
When should you consult a doctor about diaper rash?
Most diaper rashes disappear within a few days. However, the French National Health Insurance Fund recommends consulting a doctor promptly in the following situations:
- the baby is under 6 weeks old;
- the rash spreads or persists for more than three days despite treatment;
- a fever develops;
- blisters, pustules, or crusts form;
- white deposits appear in the mouth.
Moderate diaper rash may also be reported during a routine follow-up appointment with a general practitioner or pediatrician.
What the doctor checks and may prescribe
The doctor first confirms the diagnosis. Several conditions can resemble diaper rash: seborrheic dermatitis, atopic eczema, contact eczema, psoriasis, impetigo, or scabies. If your child also has patches elsewhere on the body, our article on infant eczema provides useful guidance.
First-line treatment combines hygiene care with a copper or zinc oxide ointment. In cases of candidiasis, the doctor prescribes an antifungal cream from the imidazole family, to be applied after each wash. If chronic diarrhea is maintaining the irritation, that cause must be treated.
The 2014 review notes that zinc oxide or petroleum jelly ointments, with or without vitamin A, have comparable effects on the severity of diaper rash.
Disposable diapers and chemical substances: where do the assessments stand?
Many parents wonder whether diaper composition plays a role. This question concerns a long-term toxicological assessment, distinct from the mechanical and chemical irritation that causes diaper rash.
Anses issued opinions on the safety of diapers in 2017 and then in 2019. The DGCCRF subsequently tested 32 products in 2019 and early 2020, followed by 9 products under monitoring at the end of 2020. In its report published on February 23, 2021, it indicated that no allergen or PAH had been detected in these 9 samples. Formaldehyde was present in all the products, at decreasing levels. Dioxins, furans, and PCBs remained below 10% of the health thresholds. The DGCCRF concluded that no health risk had been identified.
At the end of 2020, France proposed a European restriction on these substances. On September 10, 2021, the Risk Assessment Committee of the European Chemicals Agency considered that the data did not demonstrate a risk at the levels measured. It nevertheless specified that it could not completely rule out any risk. It recommended keeping these substances at the lowest possible levels.
We have provided details on what formaldehyde and the other monitored substances involve in our article on the chemical safety of baby products.
Cloth or disposable diapers: which limits diaper rash?
The sources consulted do not reach a definitive conclusion. Assurance Maladie mentions highly absorbent cotton diapers as an option, with a non-allergenic detergent. The 2014 review makes no recommendation regarding diaper type. What emerges from all the sources is the importance of an absorbent diaper that is not too tight and is changed frequently.
If you use cloth diapers, changing frequency and washing are particularly important. Our article on organizing cloth diapers details the routine, and our guide to washing baby clothes helps you choose the detergent and temperature.
In summary
- Diaper rash in infants is irritation of the diaper area, common between 6 and 12 months, which generally clears up within a few days.
- Basic care: frequent diaper changes, rinsed syndet cleanser, patting dry, copper or zinc cream, and leaving the bottom uncovered when possible.
- Avoid: talc, fragranced or alcohol-based products, plastic pants, and creams containing certain irritating substances.
- Seek medical advice promptly if your baby is under 6 weeks old, if it lasts more than three days, or in case of fever, blisters, pustules, or white patches in the mouth.
- Public inspections of disposable diapers have not identified any health risk at the levels measured.
Sources
- Assurance Maladie (ameli.fr), “Diaper rash in infants: symptoms, causes and progression,” updated April 29, 2026.
- Assurance Maladie (ameli.fr), “Preventing diaper rash in infants,” updated June 19, 2023.
- Assurance Maladie (ameli.fr), “What should you do if your baby has a red bottom?” updated June 19, 2023.
- Assurance Maladie (ameli.fr), “Consultation and treatment of diaper rash,” updated June 19, 2023.
- Blume-Peytavi U. et al., “Prevention of diaper dermatitis in infants — a literature review,” Pediatric Dermatology, 2014, 31(4), pp. 413-429.
- DGCCRF, “Chemical substances in baby diapers: the DGCCRF’s latest investigation confirms the improvement in product quality,” February 23, 2021.
- European Chemicals Agency (ECHA), “Risks from chemicals in baby diapers not demonstrated,” September 10, 2021.
This article is for informational purposes. It does not replace the advice of a healthcare professional.
