Mine did that and I sprayed them with a calcium spray and it seemed to work.
I cant be 100% sure that is what fixed it but its worth a shot.

"Penny O" wrote in message
...

I have a couple of squash plants growing really well up a bamboo wigwam.
They have produced loads of flowers, and then start to develop small
yellow squash. However, the squash don't grow more than 2-3 inches in
diameter, then stop. The earliest ones have now gone a bit brown, so i
took them off. There are about 10-12 other squash still on the plant.
Are there too many? They are growing in our own compost in a raised
bed. How do i make them grow bigger?




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Penny O