@Prestel
itispersonal
I think you might be overlooking the fact that the majority of child tax credits, which is the benefit affected by the two child limit, is paid to people in work.
Also the majority of children living in poverty live in working households. The two child limit affects a far wider range of people than just the unemployed.
I know it's not blanket, working poverty and those just over the threshold (but in poverty) and don't get any help at all.
I have also been on tax credits as a top to mine and my dps wages when my dd was first born. I use to dread maybe earning over the threshold, by doing overtime, and then have to potentially pay it back and struggle for the next year. I also would have loved to have had another child but our financial circumstances didn't allow for it.
Previous generations all had to make decisions on how many children to have / keep, even before the benefit system. And this involved back street abortionist, adoption, sending children away to live with other family members, if they were lucky.