A term infant is being invasively ventilated in the pressure…

A term infant is being invasively ventilated in the pressure targeted SIMV mode of ventilation; set rate is 16, PIP is 18, PEEP is 4, and FIO2 is less than 30%.  The physician would like to wean the infant from the ventilator.  The clinician has tried turning the patients set rate down to 10 breaths a min but the infant immedicately becomes tachypneic and desaturates to 85%. Which of the following should be done at this time?