I did wonder this too, mainly because of silly comments from my mum about how far apart her legs were in her cloth...anyhoo...it didn't hinder her at all. It helped her to sit upright as it supported her, she was crawling at 6 months and walking at 10 months, so although I had my doubts at first, no it didn't. Like a PP said, she can even stand up in her sleeping bag with her night nappy on and walk about her cot.
Lots of nappy off time is great though
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