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Updated: Sep 27, 2026

Non-Nutritive Suck Parameters Measurements Using a Custom Pressure Transducer System
Published on: April 19, 2024
The maturation and coordination of sucking, swallowing, and respiration in preterm infants
1Division of Neonatology, Chiba Children's Hospital, Chiba City, Japan.
Insights
Premature infant feeding behavior significantly matures between 33 and 36 weeks postconception. Swallowing and respiration coordination improves, with fewer feeding interruptions as infants develop.
Area of Science:
- Neonatal development
- Infant feeding behavior
- Respiratory-swallowing coordination
Background:
- Premature infants often face feeding challenges due to immature physiological systems.
- Understanding feeding maturation is crucial for optimizing nutritional support and preventing complications.
Discussion:
- Feeding behavior in preterm infants shows significant maturation between 33 and 36 weeks postconception.
- The relationship between sucking, swallowing, and respiration evolves, impacting feeding efficiency.
- Swallowing coordination with respiration shifts from occurring during respiratory pauses to the end of inspiration.
Key Insights:
- Sucking efficiency, pressure, frequency, and duration all increase significantly during this developmental window.
- By 35 weeks postconception, sucking efficiency exceeds 7 mL/min.
- The timing of swallowing relative to respiration changes, indicating improved control.
Outlook:
- Normative data established in this study can aid in assessing feeding development in preterm infants.
- Further research could explore interventions to support feeding maturation.
- Understanding these developmental milestones is vital for clinical practice and infant care.
Objectives:
Our objectives were to establish normative maturational data for feeding behavior of preterm infants from 32 to 36 weeks of postconception and to evaluate how the relation between swallowing and respiration changes with maturation.
Study Design:
Twenty-four infants (28 to 31 weeks of gestation at birth) without complications or defects were studied weekly between 32 and 36 weeks after conception. During bottle feeding with milk flowing only when infants were sucking, sucking efficiency, pressure, frequency, and duration were measured and the respiratory phase in which swallowing occurs was also analyzed. Statistical analysis was performed by repeated-measures analysis of variance with post hoc analysis.
Results:
The sucking efficiency significantly increased between 34 and 36 weeks after conception and exceeded 7 mL/min at 35 weeks. There were significant increases in sucking pressure and frequency as well as in duration between 33 and 36 weeks. Although swallowing occurred mostly during pauses in respiration at 32 and 33 weeks, after 35 weeks swallowing usually occurred at the end of inspiration.
Conclusions:
Feeding behavior in premature infants matured significantly between 33 and 36 weeks after conception, and swallowing infrequently interrupted respiration during feeding after 35 weeks after conception.
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