thanks everyone for your honest and thoughtful answers, planty there for me to get thinking about.
Yep, if I was suddenly told that's it, no more babies for you, I could handle it, but I would feel that maybe somebody is missing. I also am very concerned about the idea of a middle child out of 3 being overlooked, especially as right now with only 2, dd1 still takes up most of the time. But at least I know it's something I would be sensitive to.
Not4AnotherDay, thanks and I might just go for it!
Ben5, cuddles don't worry me. Always enough cuddles to go round, they're one of the best parts of having kids!
We're not big on hols, already live by the sea anyway, but the idea of getting about with 3 (city trips to visit family) does concern me a bit. But then those yrs fly.
I'm good with little sleep, always been a bit of a night owl and ds has slept through from early on.
Sorry long post - just thinking aloud, any more advice? All welcome.