possibility that my dream job might be available

I did my senior preceptorship on an adolescent med-surg floor at my dream hospital and LOVED IT. I currently work in psych at a hospital that was not my dream hospital. I worked in a psych hospital as a tech for my last year of nursing school, which I think helped me get in the door at my current job. I was scanning openings and saw positions in pediatrics at said dream hospital and have just received an e-mail asking me to rank my specialties. I love my job but there's a part of me that would love so badly to get that dream job now instead of waiting a year to switch specialties. I know being offered an interview is not the same as being offered a job and I would have to do some serious soul searching to switch jobs because I know it looks bad switching jobs after only 2 months. I do like my job and wouldn't switch or interview for just any other position right now but my heart lies in two specialties, peds and psych. I wish I could have waited around for the dream job, but I needed a job and didn't think something would open up. Any advice?