I suppose much depends on where you get your clinical experience - a community hospital or a dedicated children's hospital.
Peds can be the most emotionally intense - even those without children or without any particular feelings about children beforehand can come unglued at the sight of a critically ill child. It seems unnatural, and can produce an unexpected, almost visceral reaction.
Also, you are likely to encounter omnipresent families - something most nursing students haven't dealt with before coming to peds. This is a whole different ballgame - the whole family really is your patient.
In a children's speciality hospital or a university-affiliated facility you may unfortunately see heartbreaking stuff - unbelievable rare genetic disorders or deformities, cancers, etc.
Then there is the issue of abuse. You may see its aftermath, you may not. Lucky me ... I had 3 peds patients whose significant neuro deficits & seizures were at least partly the result of Shaken Baby syndrome. :stone
We also spent 2 days at an adolescent/child psych facility, and that was also difficult to take ... and I loved adult psych?!
Those who love peds seem to know it quickly, but it's not for everyone.