My friend was due in LGI when they were filming, and was approached many times during midwife appointments to see if she would like to participate.
One of the things that was made very clear to her was that participating parents would have a high degree of editorial control, and would be able to ask for portions to be edited out and/or refuse and withdraw at any point.
I am seeing a lot of threads where people feel that the mothers are very calm/stoical etc in labour but remember what a small portion this really is of something that may have been 10, 20, 30, 40 hours overall. It may very well be that some of the mothers who seemed calmest were screaming and swearing to high heaven at various points but asked to have this edited out, and some of the mothers who have been castigated for being a bit "wet" about it didn't exercise as much editorial control because they didn't feel (and rightly so!) that being in pain or scared in labour was something to feel ashamed about.
It might be real life, but it's still "only" a programme in terms of how it can really reflect reality.