Which action is essential to maintain oxygenation during resuscitation of a newborn?

Ensuring chest movement with each breath is essential for maintaining oxygenation during the resuscitation of a newborn. This is critical because effective ventilation is necessary to deliver oxygen to the baby's lungs and subsequently to the bloodstream. When resuscitating, first responders must confirm that air is reaching the lungs, which is evidenced by visible chest rise and fall. This physical movement indicates that the lungs are expanding and appropriately exchanging gases, thus facilitating oxygenation.

Additionally, confirming chest movement helps to ensure that the airway is clear and that air is being effectively delivered, which is fundamental in any resuscitation effort. Proper technique in providing positive pressure ventilation not only aids in oxygenation but also helps in the removal of carbon dioxide, further stabilizing the newborn's condition.

The other options do not directly contribute to the immediate need for oxygenation during resuscitation. For instance, frequent repositioning of the baby may help in overall comfort but does not directly aid in securing proper ventilation. Close monitoring of blood glucose levels is important for metabolic stability but is not an immediate action for addressing the urgent need for oxygenation during resuscitation. Lastly, the use of sedatives to prevent distress can complicate the situation by potentially suppressing the respiratory drive, which is counterproductive