We see everything -- everything. Remember that kids go down much faster in the ER than most nurses realize. They can be smiling and happy eating a popsicle one second and the next they can be struggling to breathe. Here are some things that I have learned....
1: Always trust your instincts... If they look fine but you feel like somethings wrong, go with that feeling.
2: Keep a list of normal vitals by age, because we will see all ages!
3: When in doubt, ask another nurse. I love and hate nurses that float. Love because they are new and they see so many things that the worn out seasoned nurses dont pay attention to but hate because they are too intimidated to ask. We dont bite. Ask.
4: If a parent is legitimately worried, you should too. They always know when something's wrong.
I think its great that you are floating! Its a wonderful place to work, crazy sometimes, but wonderful! Keep your eyes and ears open and remain calm. You know everything you need to know from nursing school.... ABCs are the priority.
Enjoy! Most nurses that go to ER dont go back.