Thanks for your responses, ladies.

You are all correct, life is busy with kids, period. But so much fun!

Car seats are not an issue as DD1 is already out of a seat and DS will be old enough (and I expect big and heavy enough) to come out of a seat in August, when he turns 7. The car itself is a problem as my car is only five seats. I would need a new car, a seven or eight seater, but that is not a big deal. Although, I really love my car, it is my 'dream car'! I think I would love a child far more than any car though...

Our house is four bedrooms, so someone would be sharing, but I don't really see an issue with that? The rooms themselves are quite large with plenty of room for two beds. Miss P has been in our bed every night of her life so I guess her room is currently 'spare'... wonder if she'll see be co-sleeping in 10 years? I wouldn't be surprised!

What are the negatives of having four kids?