You have to accept that sometimes things don’t work, that it doesn’t matter what you do or how you try to help that child and family, sometimes trying to do a procedure won’t work.  If possible, it’s better to stop, wait (even if only for a few minutes) and try again.  It’s important to talk to the child and their family about it so that you’re being open, honest and trying to plan together what to try and how to do it next time.