It is actually the other way around. I asked my doctor this the other day as she wrote 4/5 on my card. She said the lower the number (5/5, 4/5, 3/5, 2/5, 1/5, 0/5) the more engaged the babies head is.Basically it is to do with the finger widths or cm's above the pelvis bubs head was.. So you count down and when you get to 1/5-0/5 you are pretty much fully engaged.