Stopped at about 2 weeks when on we got our mirror so we can see her..it is a lifesaver (although it can also be distracting). It is helpful to see what she is doing. I hate driving with her without it. My lo enjoys the car so it's not a big deal, but if she is fussy and my husband is in the car, we will pull over and I'll hope I. The back. We've only done that twice.
Re: Backseat riding