We've just put ours up in advance of our LO crawling. In 5 minutes she's banged her head on it three times (falling backwards from sitting). When they are crawling to they have neough muscle control not to do this, do I have to pad it with something, or am I just going to have to get used to her banging her head?
What sort of playpen do you have? I assume it's wooden? I had one with a metal (padded) frame and netting surround. I didn't need to pad that. I think if you have a wooden one and she's bashing herself on it, you could certainly think about padding it a bit.