Okay, so we haven't even start TTC, but I'm totally trying to plan ahead.

Our house is two stories. The master bedroom is on the first floor, and the other two bedrooms are on the second. I'm wondering... at what age will it be okay to leave the kids upstairs by themselves? I'm thinking that when they are newborns, we'll move into one of the rooms upstairs to be close by, but I don't want to live up there forever (our master bedroom is AMAZING).

When will we be able to put up the gate over the stairs and move back into our room?