Language Exposure of Preterm Infants in the Neonatal Unit: A Systematic Review

Area of Science:

• Neonatal care
• Developmental pediatrics
• Neuroscience

Background:

• Preterm infants (< 37 weeks) in neonatal units face elevated sound levels and limited language exposure.
• These environmental factors are linked to poorer growth, cognitive, language, and motor development with lasting effects.
• While sound exposure guidelines exist, optimal language exposure for preterm infants remains largely unknown.

Purpose of the Study:

• To review existing evidence on measured and prescribed language exposure in neonatal units for preterm infants (< 37 weeks).
• To identify optimal language exposure levels that promote neurodevelopment in this population.

Main Methods:

• A comprehensive electronic literature search was performed across major databases (PubMed, MEDLINE, CINAHL, Cochrane) and Google Scholar.
• Included original research studies focusing on preterm infants (< 37 weeks) and language exposure (measured or intervention).
• A total of 2,367 articles were screened, leading to the inclusion of 16 studies after full-text review and reference searches.

Main Results:

• Preterm infants in neonatal units are exposed to significantly low levels of language and high levels of sound.
• The current body of evidence is insufficient to establish a definitive optimal level of language exposure.
• No conclusive recommendations can be made for clinical practice regarding language exposure to enhance neurodevelopment.

Conclusions:

• Preterm infants experience suboptimal language and sound environments in neonatal care settings.
• There is a critical need for more high-quality clinical trials to determine optimal language exposure.
• Further research is essential to guide clinical practice and improve neurodevelopmental outcomes for preterm infants.