LO2 is in size 3 diapers during the day, but the past few nights she has been leaking through. I have several boxes of size 4's (LO1 is in that size), so thought of trying to just go up a size at night instead of buying more diapers. I know there are specific diapers for night time, but does anyone skip those and just use the next size up diaper? Or would you suggest just sucking it up and buying night time diapers?