It can help to live with others or it can be the oposite. When my mother-in-law is manic I can tell because my house is clean. Also when she's depressed I can tell because it's an utter nightmare.

My 6 year old I call my tazmanian devil because he walks through a room and suddenly there are toys everywhere. The baby seems to be similar. My husband will clean up but only after himself because he gets resentful of all the bipolar nature of the rest of the house.