The goal of this clinical trial is to compare weaning from mechanical ventilation in critically ill children. The main questions it aims to answer are:

• Will weaning with neurally adjusted ventilatory assist (NAVA) mode ventilation result in shorter ventilator day than synchronised intermittent mandatory ventilation (SIMV) mode?
• Will weaning with NAVA mode ventilation result in shorter paediatric intensive care unit (PICU) length of stay than SIMV mode? Participants will be randomised to NAVA or SIMV group for weaning from mechanical ventilation, then PICU outcomes from both groups will be collected, analysed and compared.

Inclusion Criteria:

• all critically ill children admitted to PICU

Exclusion Criteria:

• failure to obtain informed consent