I've been saying this for years but nobody listens. I mean, you have kids because you feel lonely and take a lover. From an evolutionary psychology viewpoint people should be less interested in having children if they feel crowded. The literature is ambivalent on the topic though:
https://www.journals.uchicago.edu/doi/abs/10.1086/225997
https://pubmed.ncbi.nlm.nih.gov/1340041/
https://www.milbank.org/wp-content/uploads/mq/volume-54/issu...