john cunningham
Hi Melanie The amount of concrete depends on the weight of your son the heavier he is the more concrete you need to keep it from tipping over. Of course as he gets older he will get heavier so it's best to take this into consideration. Is the swing a metal one with four corners to bury in the ground. If it is make sure the legs are about 300mm (12") into the ground. Each leg should have at least a bucket full of concrete around it. Then re lay the lawn over the top. Leave it about thre days to set and you should be o k then. J c.
