@C8H10N4O2
Have you had a baby? The third person in the room isn’t a support to you - the mother rarely needs that as she has the midwives and her partner - that third person is a support for your DP
If DP needs a support person he is the wrong person to be a birthing partner. He needs to read up and prepare just like the mother does or lete someone else do it.
The only essential people are the woman and the baby. Anyone else should be at her invitation. If the father is going to struggle to cope then be honest enough to say so and don't guilt the mother into having additional people there for his benefit.
Fathers at births is a relatively recent phenomenon, the evidence on how this benefits the mother is pretty mixed but I've increasingly noticed a tendency to centre the wishes of male partners in maternity care rather than the needs of the woman and her baby.
I tend to agree. My youngest child is nearly 15 now and I gave birth to him alone (well, with a MW) by choice. At the time I was a member of another large but now defunct parenting forum and mentioned that this was what I intended to do. The reactions were insane, and largely fell in to 2 camps. The first telling me that I would
need someone there and couldn't possibly cope alone. Suppose, shock horror, I had to make a decision about something during labour?! Cos clearly pregnant women can't think can they? Or use a telephone if they want to talk to someone.

. The others were telling me that I was an evil bitch who was depriving my DH of a life changing experience and that he would
never "bond" with the child if he wasn't at the birth.
What a load of crap. I am pleased to report that I coped perfectly well on my own and DH has exactly the same close relationship with his youngest child as he does with the elder two - the two people who actually
wouldn't have coped alone during my labour and who were a far higher priority than the wants and needs of either myself or DH.
If a woman in labour
wants people around her then of course she should be able to have what she wants, within reason. But I do think there is a growing tendency to make birth into an "experience" for the partner and extended family, when the focus should be on the mother and baby. Some women will benefit from having their partners, mothers, friends or whoever with them and others won't. We don't stop having individual personalities when we get pregnant do we, but there is a tendency for all pregnant women to be treated the same. The current vogue, almost insistence, that the father or other family members must be there, is no better really than the complete ban on birth partners that existed in the past.