Got this off some website - good explanation of engagement, as I couldn't figure out what it all meant!
"The engagement or 'station' is usually measured in '5ths' and is based on the fact that the width of an adult hand is about the size of a term baby's head. When recording engagement on your pregnancy records, usually the amount of the baby's head that is felt by the caregiver's hand is measured and written down, providing a guide as to how much of the baby's head is engaged in the pelvis. As a guide:
If 5 finger widths of your baby's head is felt, it is written as 5/5 palpable or 'unengaged'.
If 4 finger widths of your baby's head is felt, it is written as '4/5' palpable or 1/5 engaged.
If 3 finger widths of your baby's head is felt, it is written as '2/5' palpable or 2/5 engaged.
If 2 finger widths of your baby's head is felt, it is written as '2/5' palpable or 3/5 engaged.
If 1 finger width of your baby's head is felt, it is written as '1/5' palpable or 4/5 engaged.
If your baby's head cannot be felt it is written as 'fully engaged' or 'not palpable'.
Some caregivers do not record how far the baby's head is engaged but simply write 'engaged' or 'unengaged'. Also, just before engagement the head may become less mobile, but still be fully felt. In this instance some caregivers will record this as being 'at the brim', meaning the top of the baby's is just sitting within the woman's pelvis, but not to the point of being engaged. Another term for the head being engaged is 'fixed', because the baby's head cannot be moved by the caregiver.
Most babies become 2 to 3 fifths engaged (or 2 to 3 fifths palpable) before labour commences, only becoming fully engaged during labour. If your baby is very active they may move 'in and out' of different levels of engagement during the last few weeks of the pregnancy, especially if this is not your first baby.?