It's indeed siong to hv twins, diapers & milk powder cost so much nowadays! I am trying to toilet train my twins too, but these kind of things cannot rush one leh..
Char, my gal also started going diaperless rather late. In fact now I am still trying to train her to go diaperless during her naps (actually she can, but she dun want to, cos too lazy to wake up and go toilet). I've got a suggestion for u, y dun u reward L whenever she goes to her potty and pass urine? It's because of the stickers that G's toilet training become smoother, I used to scold, beat etc, all no effect. But once i changed to rewarding her with stickers she improve drastically!