In my experience it hasn't restricted development. In fact the only child of mine to be in MCN was earliest at doing everything - rolling at 4mths, crawling at 6mths and walking at 9mths. My oldest was in flats for about 4-5 months and he didn't roll till he was 6 months. By then we was in full time sposies cos I'd given it up

Back when I was a baby it was just terry flats and they are very bulky as well. I think we are all doing what we should be.

I think plenty of nappy off time is the key but remember that all babies do things at their own pace.