First of all I accept that no contraception is 100% foolproof and pregnancy sometimes can occur even when people are trying their hardest to be careful.
I also accept that sometimes people's circumstances change and they could go from being financially comfortable to losing their jobs etc during their children's lives.
What really winds me up though are people who actively try and get pregnant when they already have several children and cannot afford the ones they already have. I sometimes see threads on here where people state they have less than £50 to feed a family of 7 for a week and no money at all for any luxuries whatsoever.
My DP and I will be in our mid 30s when we have our first child and we have decided it might be our only child. We want to be able to afford to give it a great life so have saved up hard for a few years beforehand. Between us we earn 65k so we live comfortably and don't have debts (other than the mortgage). It upsets me that we have to make the decision to only have one (possibly two) children and other people are having 5+ kids when they can't afford them.
Money isn't everything, a loving family home is always going to be the most important thing, but if you can only afford to eat lentils and never take your kids out anywhere fun or go on holiday or afford a car or pay for them to do activities outside of school or buy them a few nice things for Xmas then why keep continuing to have more and more children and making your situation even more stressful for everyone involved?! Why not just stick to one or two children?