I am happily one and done. We feel complete as a family of 3 and while I have the occasional ‘what if’ moment, for me the negatives outweigh the positives. Very different for everyone though, it took me a very long time to even consider having one child, and I never imagined myself having more than one if I ever did. I think my husband would consider another but he has said it’s up to me. For me, we can give more with one (more time, more financially). I’ve been able to be a SAHM knowing that I don’t have to save or budget for more than one. I have 4 half siblings and I’m not especially close with any of them so I don’t feel like she’s missing out without a sibling. We have a lot of friends with children, and a lot of family so she’s got a great social network.
Bit of advice I was given was "you will never regret having a baby but you may regret not having a baby" I'm in the same boat as you really struggling with it but I think if they are close in age it's not so bad because your knowledge is fresh and they grow up together and play together, alot of people have said to me they found it easier having 2 young children over having just the one, but honestly only you know what you can and can not deal with, I still haven't made my mind up 😂