It's not bad if done for a good reason. If it's because you had problems getting along with people or performing up to a certain level it will be hard to hide from that or brush it away. Wherever you go will want to know why you are transferring.
I don't know where 2nd year spots are listed. Program directors often have this type of info. If you are going to leave, you are going to have to talk to your PD eventually anyway.