This study is planned as a part of the post market clinical follow-up (PMCF) on a CE marked product. The purpose of the study is to demonstrate, in a routine clinical environment across a number of centers, that the fabian-PRICO can adequately maintain oxygen saturation, with minimal staff intervention.

This is a randomized cross-over study. Subjects will be assigned to two, nominally 24-hour interventions, one with standard manual titration of FiO2 and the other with automated adjustment (PRICO). The order of these two interventions will be random.

In addition to the ventilators data, basic demographics (i.e., gestational age, birth weight, age, weight at study) of the participating infants will be recorded in the eCRF.

This study has no additional follow-up visits.

Inclusion Criteria:

• Respiratory insufficiency of infants in the neonatal unit who require respiratory support and supplemental oxygen in one of 4 the therapeutic categories (Intubated HFO, Intubated CMV, Non-Invasive nasal mask, nasal cannula).
• <30 kg at study entry
• Informed Consent Form obtained as per EC requirement

Exclusion Criteria:

• Not expected to complete 48 hours of the current respiratory support therapeutic category
• Congenital anomalies
• Uncontrolled hemodynamics
• Severe airflow obstruction
• Intracranial hypertension
• Start of caffeine therapy within 12 hours
• Attending physician does not believe participation of the patient is in their best interest.

Members of the Investigational team will periodically review records to identify and maintain a pool of potential investigation candidates from the NICU. It is anticipated that this pool will be significantly larger than capacity of the team to enroll into the investigation.

The parents of potential candidates will be approached for discussion and consent prior to the desired intervention.