Hotl- I had my girls there (well they were somewhere in the house we still arnt sure where and what they saw!!)
But there we in the room pretty much the second after she came out I know for sure! Dd3 who was 4 still talks about the mess and how her hand got all sticky. I did notice through one contraction she put her hands over her ears but she doesn't like loud commotion anyway.

The older ones weren't fussed. We also read the book hello baby many times before birth and we had also watched a few you tube videos together.