Im 39 weeks and expecting my 5th baby. My youngest is now 14 years old so have had a big age gap. I was wondering will it be like a first birth as its been so long or will my body just go into auto mod and remember what to do? My 4th child was born very quickly within 45 minutes of my waters breaking and contractions starting, so will this one be the same or will it be like my first again 18 hours. Also whats the likely hood of going over due this is a big baby according to scans she is already 9 1/2 lb my last child was 8lb and 3 weeks early.