I'm almost 37, 2 dc, one is a teen and other is just 1 yo (different dads). Been with DP (father of 1 yo) for almost 7 years. We said this would be our only baby. However I'm really struggling with the thought of never having a baby again when my youngest grows up. I was young when I had my first dc and I did most of it by myself as a single mum. Part of my reason (amongst many) for wanting my second dc was to raise a baby with someone I love and as part of a family instead of being a single parent. My dc are close despite the age gap - my eldest loves their baby sibling and vice versa - and its honestly adorable to watch. But I'm really struggling with the fact that my eldest will be an adult very soon and have their own life, and due to the age gap youngest will essentially be an only child. My eldest has been an only child for most of their life and whilst I don't think it's impacted them negatively, I do wonder how life might have been different if they'd had a sibling their own age. So I'm now wondering - before it's too late as I'm 3 years away from 40 - whether to consider a third dc. I had a pretty awful pregnancy and post natal period (physically and mentally) - this past year has been tough to say the least. But I survived it. DP is skeptical about another as - in his words: "I couldn't watch you go through all that again". It's not a flat no, but he's definitely not keen right now.
Am I being unreasonable to want this? Should I just be happy with my two dc, regardless of the age gap?