My DS is 21 months old and the idea of a 2nd baby still scares me to death. I have PND and am still working through my issues. I am finding the toddler stage can be just as difficult as having a 9 month old baby, just in different ways. My DS is very active and wants my attention constantly. I find it hard to get normal tasks done at home let alone looking after a newborn and a toddler. I do want a second one but am thinking when DS is 4-5. I think i will be able to be physically and mentally ready at that stage. Everyone is different and it depends on what you can cope with. I don't have much practical support and I know I will have to cope on my own which is why I am happy to put it off for awhile. Best of luck with your decision, but I think you will know when the time is right, if at all. You don't have to have a second at all, it is totally up to you and your husband