Preterm Infant Skin Structure Is Qualitatively and Quantitatively Different From That of Term Newborns

Area of Science:

• Neonatal Dermatology
• Developmental Biology
• Histopathology

Background:

• Immature skin of preterm infants is highly susceptible to pressure and chemical damage.
• Understanding skin development is critical for infant care and treatment strategies.

Purpose of the Study:

• To qualitatively and quantitatively describe the histopathologic patterns of skin development in preterm infants.
• To identify reproducible milestones in preterm skin maturation.

Main Methods:

• Examination of autopsy skin samples from 48 preterm infants (18+ to 36 weeks gestation).
• Inclusion of control groups: term neonates and older infants/children.
• Quantitative analysis of stratum corneum, epidermis, and dermis thickness.
• Qualitative assessment of stratum corneum, rete ridges, and hair follicles.

Main Results:

• Reproducible patterns of skin maturation were observed.
• Compact keratin emerged around 21-22 weeks gestation.
• Basketweave keratin became generalized around 28 weeks corrected gestational age (CGA).
• Rete ridges appeared at approximately 30 weeks gestation.
• Epidermal and dermal thickness increased with age.
• Shorter survival (≤7 days) was associated with thicker dermis, independent of CGA.

Conclusions:

• Preterm infant skin development follows predictable milestones.
• Significant structural maturation around 28-30 weeks gestation likely enhances barrier function.
• Findings have implications for topical compound application (e.g., chlorhexidine) and pressure injury assessment in preterm infants.