Oh and Freya, thanks for your perspective. I really appreciate that. Dh also worries about the idea that our eldest would be turning 9 by the time our youngest was 2 if we had a fourth and we continued our pattern of having them 2.5 years apart. And so he worries about the idea that she will spend her childhood with really sleep deprived, somewhat shouty and overwhelmed parents, who are only just coping. I cope better than he does but I certainly have my days. It becomes very apparent that I am a very annoying personality type, who likes to plan everything, and if I haven't made a plan, it drives me bonkers! Lol! Oh dear!