I've just had my sister to stay and she was saying that I need to get a play pen BEFORE my DS starts to crawl so that he gets used to being in it before he discovers the joy of shooting off all over the house (he's 7 months old). Otherwise he might refuse to go in it. This got me thinking? Do I actually need a play pen at all? I do like the idea of being able to contain him, but my DH reckons play pens are baby prisons. He hates the idea. But then he ain't at home all day with baby, is he. So, the question is, should I get a play pen and if so, which one would you recommend?