Looking into this idea that if you have your first baby and it hits you like a ton of bricks as they don't sleep well, cry often, colic, reflux and in general are difficult (no matter how much you love them!) surely this would put you off having or wanting anymore?!
I've seen mums who clearly have found parenting their first little one an absolute breeze, sleeping through/well, feeding well which is really great but surely they are the ones who have more children?!
No one speaks much about temperament of children..