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Any parent who steps out of line and tells another parent they're disillusioned, depressed and disheartened is still seen as a bit peculiar and lacking normal human reactions.
But anonymous internet sites tell a different story. Parents let rip with their secret thoughts and feelings and some of them are at their wits' end. They fantasise about getting their children adopted, killing them, killing themselves. And they wonder why on earth they wanted children in the first place.
It may be just a small minority of parents who feel like that, but nevertheless it contradicts the stereotype that once your child is born the natural parental instinct kicks in and you turn into a loving, devoted mum or dad who takes to childcare like a duck to water.
Sites like Mumsnet, Netmums and Parentline Plus are full of despairing confessions from parents who feel totally inadequate and inept and are begging for advice on how to cope better with a hopeless situation.
What causes all this hidden misery is anyone's guess. The experts have plenty of ideas - post natal depression, too much anxiety and stress, perfectionism, rosy expectations of parenting, the urge to compete, you name it.
Certainly it can't help that having a child is so often idealised as the best experience you can have, giving your whole life a new meaning and totally reinvigorating you. If the reality falls in any way short of this utopian picture, then of course you're going to feel pissed-off and cheated and wonder where you're going wrong.
But the fact is that childrearing is full of trials and tribulations and pitfalls like anything else in life, and it doesn't necessarily come naturally to anyone.
Perhaps if we were more realistic about what it involves, there might be fewer distraught mums and dads wanting desperately to turn the clock back.