There's 20 months between my first 2 and each time I have tried to achieve a similar gap but it's taken longer and longer to conceive. I hoping it doesn't again. I've got 20 months, 2 years 4 months and 3 years 7 months between my boys and I preferred the smaller gap when I was still in the world of babies and pushchairs etc and also (although it's probably personality) with the smaller gaps I found the boys adjusted much easier to a baby, when ds4 came along ds3 had a harder time adjusting. The older ones are do close now, they share much of the same interests, their ages mean they can do the same things rather than someone being left out and they even share a lot of the same friends, although have their individual friendship groups too. I worry that in a couple of years I'll have the big 3 all off doing something together and ds4 at home, moaning "big why can't I go?" And feeling left out. So if really like to be pregnant this year and get less than 2 years gap.