To those who say they judged their friends for doing CC at a young age, or leaving the baby to cry for half an hour because it wasn't quite feed time - weren't you tempted to actually try and support your friend at all? 
I didn't know a bloody thing about babies when DD was born. I'd been on MN and had been greeted by a raft of opinions mainly saying don't read the books, just do what you feel is best.
But as I said, I didn't know a thing. I didn't know how regularly babies fed. I didn't know how much they should sleep (or equally that they generally need help to sleep). I was the first of my friends to have a baby, I didn't have babies within the family. You have half-formed ideas in your head: sure, babies wake in the night - but how often? Sure, they eat regularly - but how much, and how often?
And so for the first few weeks, DD and I were both an absolute state because neither of us had a clue what was going on.
And the I attempted to keep her in a wrap next to me like all the currently popular guides said and she turned into a demon baby as she hated it that much 
So a new mum of a few week old baby who is expecting them to wait until on the dot of a minute to feed, or not to wake up 4 times a night, probably just doesn't know what babies normally do. She's found one guide, which clearly isn't suiting her baby.
But instead of being supported, being shown other guides, being told about other babies needs and wants at the same age - nope, she gets judged. Because apparently being in possession of ovaries means that you are born with an innate, magical knowledge of exactly what babies require.
Way to be supportive and helpful 
Sorry, but the whole instinct thing really fucks me off. If you're not allowed to read any books about raising a baby because they are all apparently wrong, how the hell are you supposed to learn how to care about a baby when you have no experience of one?