You are completely right about this. And of course it makes a difference.
Both my DDs were overdue and so although I realise twins would come early, I have tended to discount them coming very early, but I do appreciate that could happen and I honestly don't know how I'd manage. Also my two children to date have been very easy babies/toddlers (they are currently 24 and 10 months btw), but yes, I'm overdue a nightmare baby that does not sleep for more than half an hour at a time!
I realise clubs etc as they are older will add up, but surely this cannot be more than childcare costs when they are pre-school? I'm currently paying £2k a month ffs!
My plan is to stay in my present job long term, and I'm hoping once they are mostly/all in school to change my hours to 4 or 4 1/2 days, but over 5 days - with 2 full days in the office and 3 days at home, working school hours. I work for a trade union so they are "nice" with these sorts of things, and I'd be surprised if I could not do that.
Although I have always wanted twins, it's more saying goodbye to 4 than twins that I feel sad about. My original plan was to have 2 transferred, and if I had one baby, then that was meant to be. I'm just getting cold feet because bearing in mind my success so far (2 single transfers, 2 children), then the chances of twins are probably very real. In theory I could probably have more in the future (my eggs were frozen when I was younger for medical reasons, and I have an abundance in the freezer), but psychologically I've decided this is my last pregnancy and I know that unless I prepare myself that way I will always pine for a fourth - medium to long term a big age gap is hard as a single parent. Having them close together does make many things easier when they are school age.
I did come on here to be told I was crazy and should have just one, which my head knows is what I should do, so thank you for (mostly) confirming that.