I think generally, in the vast majority of cases, you do cope.
It doesn't mean its easy, though.
I hurled myself into the whole baby thing without much thought - I was madly in love and incredibly broody in that really weird, hormonal, irrational way.
I could never have imagined how hard I'd find it, to be honest. I got PND, but that was the least of it. I hadn't thought about the effect on my career, how we'd manage childcare or finances, the effect on our relationship (going from lovers to co-parents), the effect on my body, the effect on my social life, the real lack of freedom and onset of responsibility that having a child brings....everything changes. I hadn't actually realised that
. I was probably a bit thick.
My first child was diagnosed with autism at 5. No signs at all as a baby, it only really emerged in his late toddler years. Thats the thing, really. You dont just get a cute little baby. You get a child. A child that may have challenges, and even if not, that definitely won't always be cute and lovely and snuggly.
No regrets. I'm years down the line now, I have two DC, and its all good. But if I had my time again, I would have really thought things through a bit more seriously before taking the plunge.