I understand the angry responses to the OP, who has mysteriously disappeared which is a shame.
However, I am not sure it's totally helpful as we end up with a list of mums saying YES! It's very common! Which 1st time pregnant mums reading this may take to mean that it is common, as opposed to what's actually being said which is that it's horrific to make judgements about the way people feed their babies, and some people's experiences are very traumatic.
Clearly, there are women who don't make enough milk for a whole load of reasons. However, for many of them who genuinely are not producing enough, as opposed to feeling that they're not because of normal, but distressing and unexpected baby behaviour, there are ways and means to improve supply if - and only if - the cause of the problem is actually diagnosed in time.
To fill this thread with indignant cries of "I couldn't and my baby really suffered" simply makes it seem like it IS a really common problem. Whereas it's very, very rare for some to actually not be able to WITH THE RIGHT TREATMENT GIVEN IN TIME.
Many women will go to hell and back trying to breastfeed (we've seen lots of these stories here tonight) and what makes ME angry is that these women and babies are missing out on the medical treatments that they need because there are so few specialist lactaction practitioners around. And I don't mean peer supporters - I mean highly qualified and experienced medical people who understand the wide range of problems which can occur - from physical problems in the baby (eg cleft palette, tongue tie, cranial problems), physical problems in mum (eg milk producing tissue damage/underdevelopment), hormonal problems in mum, the list is HUGE.
It is very, very common for mums to mums to honestly think they've not got enough milk, when actually it's just normal behaviour. It's less common for mums to not have enough milk because of a problem which can be treated (if given the right help). The right help is rarely there. It's very rare - but possible - for mum to just not have enough milk, full stop. But women in the latter two categories often try SO hard to BF and end up so distressed that threads like this must be like salting an open wound :(
What makes me angry is those women who, with the right help and medical treatment, could breastfeed if they wanted to (and look how hard people who've posted here have tried :( ). But sufficient help isn't there.
What makes me sad is those women who THINK they've not got enough milk, but actually they do. Which is why I suggested that the OP train as a peer supporter so she's in a better place to explain things to mums.
I'm giving the OP the benefit of the doubt, that actually she's not coming across as she means, as to be as judgemental as she says she is would be quite horrible and grossly unfair. I'm sure that's not the case but it would be nice if she came back to clarify.
And a really good book to read about low or absent milk supply is "The Breastfeeding Mother's Guide to Making more Milk" (Diana West and Lisa Marasco). It explains normal infant behaviour, which is reassuring, and then explains about problems which CAN be fixed (and how), and problems which CAN'T and babies need to be supplemented or fully FF.