My two sisters have two children each (a boy and a girl each) and I can couch first hand just how quickly children (especially when they are a baby) can wear through things before the money you have handed over has even left the till.
Clothes are obviously top of the list, as the child grows they need replacing regularly, but the one other thing that they go though very quickly are prams. Every month it seemed like my sisters were purchasing new ones for the kids.
It is a good job that there are online stores around like babythings4u.co.uk who sell items like prams, high chairs, car seats, safety gates, bouncers and other items, at very low prices so it does not leave a huge hole in your pocket each time you need to replace them.
They sell a huge wide selection of different types of pushchairs that means almost anyone will be able to find a pushchair that will suit their needs. Weather you want a normal one, a double one or even one that means you can go jogging they are all here and very cheap.
The prices are actually better than what most of us will find in our local high streets as well.