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Published on: October 31, 2025
Transferring preterm infants into an open cot using a heated mattress at ≤ 1400 g
Dimitrios Rallis1, Catherine Longley2, Anup Kage2
1Imperial College Healthcare NHS Trust, Neonatal Unit, London, UK. dimitrios.rallis@nhs.net.
Insights
Stable preterm infants can move to an open cot before 33 weeks corrected age and at weights less than or equal to 1400 grams. This early transfer is associated with improved outcomes.
Area of Science:
- Neonatal care
- Pediatric medicine
- Infant development
Background:
- Preterm infants often require specialized care in incubators.
- Transitioning to an open cot is a significant developmental milestone.
- Optimizing the timing for transfer to an open cot is crucial for infant well-being.
Purpose of the Study:
- To evaluate the corrected age and weight for transferring preterm infants to an open cot.
- To compare outcomes for early versus standard transfer groups.
- To determine safe parameters for open cot transition.
Main Methods:
- Retrospective cohort study design.
- Analysis of 135 preterm infants in a tertiary neonatal unit.
- Categorization into early (weight ≤ 1400g) and standard transfer groups.
Main Results:
- Mean transfer weight was 1370 ± 167g at 33 ± 1.8 weeks corrected age.
- Early transfer group (n=83) had a mean weight of 1276 ± 98g.
- Standard transfer group (n=52) had a mean weight of 1522 ± 141g.
- Early transfer infants showed higher weight gain, earlier discharge, and shorter length of stay.
Conclusions:
- Stable preterm infants can be safely transferred to an open cot at less than 33 weeks corrected age and weights ≤ 1400g.
- Early transfer is associated with positive clinical outcomes.
- This study provides evidence-based guidelines for optimizing open cot transitions.
Objective:
The objective of this study is to evaluate the corrected age and weight that infants were transferred into an open cot using a heated mattress, in overall and within the subgroups of early (weight ≤ 1400 g) and standard transfer (weight > 1400 g).
Design:
Retrospective cohort study in a tertiary neonatal unit RESULTS: One hundred and thirty-five preterm infants were analysed. The mean weight of moving into an open cot was 1370 ± 167 g at a corrected age 33 ± 1.8 weeks. Eighty-three infants (61%) were transferred early at a mean weight 1276 ± 98 g compared with 52 infants of standard transfer with a mean weight 1522 ± 141 g. Infants of the early group had higher weight gain, were discharged earlier and had shorter length of stay.
Conclusions:
Stable preterm infants can be safely moved to an open cot at < 33 weeks and weight ≤ 1400 g.
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