I recommend hypnobirthing too. I have a book balled Mindful Hypnobirthing and I really found it calming to read.
This isn't my first baby, but I think most women feel slightly nervous about birth simply because you don't know what'll happen. When will labour start? How long will it last, etc?
I'm definitely not a fan of medical interventions but it's good to know they're there in the unlikely event they're needed. I think there are three reasons when intervention is needed:
1) if the woman lacks confidence and is eaten up by fear ( I had a friend like that and I just knew she'd end up having an intervention, even though actually she could have given birth naturally if she'd remained calm and confident)
2) if one intervention leads to others eg, if you have an epidural, the figures say you're 50% more likely to need intervention.
3) if there's a medical reason.
You can hopefully avoid the first two of those and the 3rd reason is a good one so nothing to worry about.
Your attitude towards birth counts for a lot. Your body is made to do this and you should be confident in your ability. There's no reason why you can't have a natural birth. The births we see on TV are the extreme versions. Childbirth can be natural and stress-free. Don't let the extreme births make you think it has to be like that. We hear the drama but we don't hear from the thousand and thousands of women who have peaceful, uneventful births.
Be confident in your abilities
