Well as a "not new mum" I remember being scolded in public by an older man for daring to have my 4mo baby (second child even!) sleeping in the stroller with her hat over her eyes. He even reached in to push it back while tutting at me. However if he'd bothered to actually talk to me rather than assuming he knew everything, I could have told him that for some reason she preferred the hat over her eyes and would wriggle herself until it was in position then go to sleep. If I pushed it back off her she would fuss and wriggle until it was back where she wanted it. She's still very fabric-fiddly and cuddly as a 7yr old so I guess it felt good to her because she's, you know, a person.
That's the sort of things mums know about their babies, but good old Joe Bloggs on the street (or his cousin Jane on the internet) knows better right? I mean, surely Archie can't have a preference for being held a certain way or have been feeding or didn't like the carrier that day - it has to be because MM is evil and can't even care for her own kid right? I mean for Pete's sake, many times I was half-slung for numerous different reasons but the babies were happy and safely supported by those things called arms and I was happy so who cares?
Also 
to those betting MM doesn't / didn't breastfeed because she's horrible and wouldn't want to - I breastfed all my kids and it says diddly squat about me as a person or as a mum, just like bottle-feeding says diddly squat about parents who choose that. Gotta love mum shaming on mumsnet. Ridiculous.