No worries I've been thinking about it a bit more and I think it works so well because I have that gap of older kids who are pretty self sufficient when you need them to be and then only one that I was, until a few months ago, doing the 'baby thing' for. I have the older 3 kids doing weekend activities and DS2 just plods along for the ride. at this point in time, if i had all 4 of them doing stuff it would be too much. Plus I look at it from a car seat perspective and I can have DS1 in the front seat now and don't need to have a car full of car seats and boosters. It's also a big thing when it comes to preschool and school. I had one start school every two years - DS1 in 06, DD1 in 08 and DD2 this year - and I had a 5 year run of preschool (DS only went for 1 year otherwise it would have been 6 years) and it was madness! This year I have the three older ones in school and DS2 starts preschool next year, so I've only had school to worry about. Having that year off from doing both has been great and I'm really looking forward to getting back into the preschool life again, whereas by the time DD2 finished last year, I was totally over it.