My DDs head was just in the wrong position, and wouldn't come down. After my emergency c-section, the doc reckoned we made the right decision (she had had a bit of distress, but we could have tried to push for longer, but they said that we would probably still be in the same position in 2 hours time, and still heading for a caesarian), coz apparently she really was stuck in there, and wasn't going to come out on her own.