Final answer:
In a neonatal resuscitation with no signs of meconium present, the first measures to be taken include ensuring a clear airway and providing positive pressure ventilation if the newborn is not breathing or gasping.
Step-by-step explanation:
In a neonatal resuscitation with no signs of meconium present, the first measures to be taken include ensuring a clear airway and providing positive pressure ventilation if the newborn is not breathing or gasping. The healthcare provider should place the newborn in the proper resuscitation position, clear any secretions or obstructions from the mouth and nose, and administer positive pressure ventilation using a bag-mask device. This will help establish an adequate respiratory effort and provide oxygen to the newborn's lungs.