Evidence-based Formulation Principles

Emollients play a crucial role in maintaining and protecting the infant skin barrier. The unique physiology of neonatal and infant skin requires specialized formulations distinct from adult products. Appropriately formulated emollients enhance stratum corneum hydration, helping to maintain the softness, suppleness, and overall integrity of delicate infant skin.

Infant Skin Physiology

Infant skin is structurally and functionally distinct, with a thinner stratum corneum, higher transepidermal water loss (TEWL), elevated surface pH, and a developing microbiome. These characteristics increase susceptibility to environmental stressors, irritants, and pathogens¹. Supportive skincare during this period is essential to promote barrier maturation and maintain hydration.

Key Formulation Considerations

• Lipid composition: Effective emollients for infants should replicate the stratum corneum’s natural lipid composition. Evidence supports that balanced ratios of ceramides, cholesterol, and free fatty acids optimize barrier repair and hydration².
• Humectants: Humectants such as glycerin and hyaluronic acid enhance moisture retention without disrupting barrier function.
• pH considerations: Maintaining a slightly acidic pH (4.5–5.5) supports acid mantle development and a healthy microbiome³.
• Preservative systems: Preservatives should have established safety profiles, such as phenoxyethanol (<1%)⁴, while avoiding parabens and formaldehyde-releasing agents to reduce sensitization risk.

Semi-occlusive agents, including dimethicone and selected vegetable oils, provide moderate occlusion without impairing barrier development.

Clinical Evidence

• Early initiation of daily specialized emollient application within the first 4 days of life, continued for 8 weeks, has been associated with a reduction in cumulative atopic dermatitis risk by approximately 50% at 6 months and 29% at 12 months⁵.
• Emollients effectively manage xerosis and moderate-to-severe dry skin, particularly when applied twice daily.
• In premature infants, lipid-containing formulations accelerate barrier maturation, reduce TEWL, and may lower the risk of infections in neonatal intensive care settings.

Safety Considerations

Infant emollients should minimize allergens, avoid fragrance and lanolin derivatives, and use appropriate vehicles. Oil-in-water emulsions are preferred for routine care⁶, while water-in-oil formulations offer enhanced barrier protection.

Overall, evidence supports that carefully formulated emollients are both safe and effective for supporting infant skin health.

Conclusion

Evidence-based formulation of infant emollients requires careful consideration of the unique physiological characteristics of developing skin. Optimal formulations balance efficacy, safety, and sensory properties while supporting normal barrier development and function.

Clinical evidence supports the regular use of appropriately formulated emollients as a cornerstone of infant skin care, with potential benefits extending beyond basic moisturization.

References

1. Kong F, Galzote C, Duan Y. Change in skin properties over the first 10 years of life. Arch Dermatol Res. 2017;309(8):653–658.
2. Lim SH, Kim EJ, Lee CH, et al. Lipid mixture enriched by ceramide NP. Skin Pharmacol Physiol. 2022;35(2):112–123.
3. Kim HB, Alexander H, Um JY, et al. Skin microbiome dynamics in atopic dermatitis. Allergy Asthma Immunol Res. 2025;17(2):165–180.
4. Dréno B, et al. Safety review of phenoxyethanol. J Eur Acad Dermatol Venereol. 2019;33 Suppl 7:15–24.
5. Ní Chaoimh C, et al. STOP-AD randomized trial. Allergy. 2023;78(4):984–994.
6. Sarkar R, Basu S, Agrawal RK, Gupta P. Skin care for the newborn. Indian Pediatr. 2010;47(7):593–598.