Re: Low tech is too old tech @Dave
Unfortunately, decreasing the infant mortality does not in itself reduce population growth unless tied to education that large number of children is not desirable.
Many people living in marginal environments have to have a lot of children because not all of them survive, and their children are their pension. But they don't necessarily make the link between these things themselves, it's ingrained in thier society. In these societies, having a large number of surviving children is a statement of high status, and this will not change overnight.
Just allowing more of the children to live is not going to immediately reduce the family size, at least not until the 3rd or 4th generation. By this time, exponential growth as a result of more children reaching childbearing age will make the situation worse.
In the long term, I do agree, but it's not enough in itself.