Oh I agree each baby is different.. but people put forward this thinking that babies need to sleep through the night, and that they're 'bad' or 'difficult' babies if they don't, and sadly it leads to formula top ups, which then leads to stopping b/f all together, or they start solids early, which isn't good for baby, and they try controlled crying etc etc... all this can generally stress out the parents and baby, when really they shouldn't stress, coz it's sooooooo normal for a baby to wake through the night, even until they're 2.

People need to be aware it's more than just 6 weeks or 3 months of disturbed sleep BEFORE they have the baby... they're possibly in for a couple of years of rarely getting a full nights sleep again.