Lived 2 states. Recv. RMD while living in state 1. Do I pay taxes on RMD in just state that I received ,or spread it betw 2 states according to time lived in state?

Moved after 1st q. 2018 to another state.  Received RMD withdrawal + a lump sum withdrawal from IRA while living in 1st. State.  Do I declare total withdrawal as income in 1st State only or do I prorate it between 2 states depending on months lived in each state?