I have just volunteered as a service user in the whole-day selection events for midwife degrees at my local university (I was one of two people on one of the panel interviews). From my experience doing that, my advice would be:
Please please please say more in your application than "I'm a very caring person". Why do you want to do midwifery rather than, say, nursing, or counselling, or being a nursery nurse?
Don't say anything fluffy like "I want to help women and be their friend". Sound professional in what you put in your application.
Think about the other skills you bring which aren't necessarily apparent to pregnant women, but are very important in being a midwife. For example, calm under pressure, good at working in teams, interested in the biological / scientific side of it and capable of doing academic-type work on this, good at time management, able to prioritise well.
Have you thought about the academic demands of the course and how you are going demonstrate in your application that you will cope well with them?
Are you actually interested in biology? Do you know what some of the current issues are in midwifery? Might help to look at a couple of the big midwifery journals.
Remember that the role of a midwife extends far far beyond the actual birth of a baby. So many applicants I saw just focussed on births in hospitals - this is only part of it.
If you are motivated to be a midwife by having had your own children (if you have), can you analyse why exactly this is? If you had an inspirational midwife, what exactly made her inspirational?
Hope that helps!