I don't think that the article is implying that mothers shouldn't use prams at all, it's just saying that they shouldn't be thought of as "necessary". I agree that prams are useful, e.g. you can put your shopping in the bottom, but I also agree with the sentiment that carrying your baby is more natural and should be encouraged where possible. Western society has gotten too used to the line of thinking that babies shouldn't be worn. E.g. many mothers I know really believe that carrying a baby a lot will give you back problems, etc, which is simply not true (unless you get a bad sling/carrier or use it incorrectly).