Love: the critical thinking aspect of my job (everything must be so precise because there is little room for error due to the patient's size and their critical status), the education I provide to my patient's loved ones, the long-term relationships I form with families and getting the privilege of witnessing a really sick kiddo transform into a po feeder and grower and eventually be discharged!
Hate: Interacting with some drug addicted mothers who could have potentially birthed a healthy infant had their choices not got in the way, who never visit and when they do are sleeping or texting at the bedside. I hate the really sad cases, the patients with grade IV brain bleeds that you know will never live a "normal" life, the ones that the docs encourage the family to do only palliative care, but the families can't bring themselves to make that awful decision. The patients who die unexpectedly or families that never visit their kid or call for status updates for weeks at a time.
I would be a sponge if I had an opportunity to observe in the NICU. Ask tons of questions! You probably won't be able to absorb 1/2 of it just yet, but ask the whys behind what they are doing for the neonate, what the ventilators are, why they chose this type of ventilation over another, the trajectory of the patient's likely course of treatment.
I didn't know I loved the NICU until I got to shadow in there during nursing school
...now I couldn't imagine doing anything else.