Andrew is 15 mo and I can stall him 2 or three minutes by saying yes, when I'm done... if I maintain some sort of physical contact with him. If I turn away he loses it. He asks by touching my collarbone with one finger, but if he's reaching up I can tell he's trying to. However, if we're not at home he barely ever asks and will take a 'no' without any fuss at all. Go figure?