Reproduction is one if the most fundamental instincts ingrained in all of nature and you’re blaming people’s desire to have kids on some kind of capitalist conspiracy.
In cities all over the world, people are reproducing less and less. Many governments have programs to encourage people to have families because it is important for the economy and sustainability of the country.
The number of children born to a given family has fluctuated over time. It's not absurd to say that the shape of our society influences family planning.
In fact, there are capitalist countries (coughJapan) where encouraging baby-making, in the face of a demographic crisis that threatens to catastrophically disrupt economic stability, is state policy.