What would it be? I'd have pushed harder for my procrastinating DH to get a proper qualification work wise so we wouldn't be under so much financial stress. I can earn a good wage but only work part time as that's what we've chosen but it is stressful and he earns decent but it's not secure. I'd also have had a bigger gap in DD and DS1 as that was honestly one of the hardest periods of my life. So that was two actually but you get the idea...!
ETA : DH also says this is the one thing he'd change just ao I don't seem like an ungrateful *****😬😬