how is Vent weaning supposed to be done?

If the patient is already on a ventilator or has any artificial airway, there should be a suction set up at bedside. It is doubtful that a patient on a ventilator has made it to the weaning phase without ever requiring suctioning. Even the oral care should require a suction setup for patients with artificial airways.

Weaning is a process and not just a spur of the moment thing. There is a list of variables that must be acceptable before it is initiated. You also did not make it clear whether your child was removed from the ventilator to a trach collar or placed on PSV or VSV.

One RT may have 6 patients to initiate a weaning protocol on before rounds with the physician to determine extubation readiness. So yes, the patient will be placed in a weaning mode, watched for a few minutes and then move on to the next patient. If the patient is in the ICU, there should be a low nurse to patient ratio such as 1 : 2, with monitoring. RNs are also capable of suctioning when the RT is not around but may have another patient. If the patient was still on the ventilator, there are many alarms that are usually set with tight parameters especially during a weaning phase. The RT may also have felt secure moving on to the next patient since you were at bedside and also a nurse. Granted you may not be familiar with ventilators or suctioning as an LVN.

Vomiting can sometimes be predicted but no always. However, it does sound like RT was there when the vomiting started. What may seem like several minutes to you as a parent, it may only have been a few seconds. I personally would have a difficult time focusing on a clock for a minute instead of my child if he was in trouble. RNs and RTs deal with parents frequently who are screaming for someone to help even when there are many professionals at bedside already helping. As a parent you sometimes lose sight and just focus on one incident.

RNs and RTs are human and both carry some big responsibilities. As much as they would like to do 1:1 care on all patients, it is not always possible. I am not trying to judge you but there is always more than one side to every story. If someone was venting about you not doing your job, I'm sure you would like your side known. If there was an error made, the peds RN and RT are probably beating themselves up since it is doubtful anyone wants harm to come to a child in their care.