Here's a video of Kim walking out of a hotel without North, looking in her car, then walking back to the hotel and coming out again, this time with North in hand.
Of course everyone's first reaction was that she just forgot North and had to go back to get her.
But Kim has taken to clear this whole thing up.
And to say that in reality she was checking for a car seat.
OR that Nori was just waiting to check out (most likely scenario).
In conclusion kim *probably* didn't forget her daughter in a hotel, but it's fun to pretend it did.