I used to be in this situation.
Prior to having our first child we both agreed that we’d only have one (for various reasons) and we were both happy with that.
However about a year after our son’s birth the craving for a second started to creep in. I really didn’t want my child to be an only child, which was a driving factor, but I also simply wanted another child.
When I first bought it up with my husband he initially laughed it off but the more I mentioned it he could see I was being serious. He remained adamant that he didn’t want another and that life was good with just one child and I was so upset. I resented the fact that he had the say, and the power to decide something so important and stop me from having something I really wanted.
I continued to bring it up again every few months and then one day, something tragic happened at work, involving the death of a child, and when I got home I cried on my husband’s shoulder for ages and due to the nature of the topic, the discussion around us having another baby came up again.
This time, although he still wasn’t 100% on board, he said he could see how important it was to me and he agreed to trying for baby number 2.
I got pregnant straight away but sadly miscarried at 8 weeks, and then it took another 11 months to conceive but the arrival of our second son has been an absolute joy to my family.
The age gap is bigger than I’d like but the boys absolutely adore each other - they’re best friends and attached at the hip all the time.
Even my husband can see that hack g a second baby was absolutely the right thing to do and he has no regrets whatsoever.
If the best excuse your husband can come up with is to complain about buying a bigger car, then it doesn’t come across to me that he’s very strongly against it otherwise he’d had much more emotional based reasons than just that.
My advice is to sit him down, in a quiet undisturbed area, and really explain to him how much you want a second child and all the reasons it is important to you. Give him the opportunity to voice his concerns, and take them on board, but as much as people may disagree with this, the only way you will get another baby is to change your husbands’ mind. That concept can be frowned upon by MN but it’s the reality.
I think some men class women as being quite wishy washy about wanting children because they think we “just want a baby because that’s how’s women are”, when in reality women usually have a very strong urge, emotionally and biologically to have another child, and it’s important your husband is really made to see why this matters so much to you.
The concept of not wanting our first child to be an only child was what I really focused on and I explained why I felt so strongly about this and how I thought a second baby could also benefit our current son as well as simply being a wonderful addition to our family in their own right, and I think when my husband really listened to me and truly heard me, as opposed to just brushing me off with jokes and excuses, he then understood why it was so important to me.
You’re in a very difficult situation OP but you are not unreasonable at all to feel the way you are. It’s hard to accept that for all the equally progress that has been made between men and women, men still hold this level of control over us when it comes to something so important as having children.
The best of luck OP and I truly hope you get your second baby.