Last night my FIL said this to us because our lo fell asleep in her bouncy chair at 6:30pm. Guess what? She proved him wrong. She slept until 1am, was up for about an hour eating and then slept until 7am!
I actually went to bed at 8:30 and was so happy to wake up when I realized she slept so long. We need to prove Grampy wrong more often.