@Caiti19
If you have overcome the trauma experienced by your own body and mind, as the one who actually went through it physically - general anaesthetic and all, it seems a little bit selfish/precious of him to put his memory of being "outside on his own" up as a reason for not wanting to have another child. I'd need better reasons.
This is enormously dismissive. My closest friend's husband is still in counselling 3 years after she had a very traumatic birth - she, by comparison, has recovered mentally very well. But his feelings of powerlessness and thinking he was going to lose his wife and child (and the guilt that it was his 'fault' because the baby was his) caused such severe PTSD he still suffers now.
Even if you're both relating to the same situation, two people can experience trauma very differently, and no two brains recover from an illness like PTSD the same way or as easily. Just because it didn't happen to him physically doesn't mean he's not allowed to be traumatised by it, otherwise nobody would ever be traumatised by witnessing awful things.
And, regardless, if he doesn't want another child just because he doesn't feel like it, that is a perfectly good reason. No 'better' reason than not wanting to needed - although if it were I'd say trauma and living space are both two 'better' reasons.
I feel for OP but let's not pretend her DH has to provide ironclad evidence why he doesn't want a second child AND he shouldn't have the audacity to be feeling the effects of a traumatic event. He doesn't want one, and that is reason enough.