Been trying to introduce the df with my 11 1/2 week old for a week now. He is in such a deep sleep that I can't even get his sucking reflex going, he only grins in his sleep and lets the nipple sit in his mouth. The stretch that I have tried it, he has woken up 2 hours after I try (I try at 11pm, he wakes at 1am) - when I haven't done the df he sleep from bedtime at 8pm until 3 or 4 am and then sleeps until around 7am. Should I just leave things be? Any suggestions on getting your lo to take the df? I do cluster feed at around 5pm and 7pm (the latter right before his bath and bedtime routine).