Not necessarily. Mortality of mothers is higher in multiple births; maybe that's a counter-pressure (fewer children). Children do worse as well ([0], [1], [2]

Not necessarily. Mortality of mothers is higher in multiple births; maybe that's a counter-pressure (fewer children). Children do worse as well ([0], [1], [2]). Ladies are not built to carry more than one child, especially considering the size of our children, and agriculture has been such a blip on the evolutionary/anthropological timescale that we have not had time to evolve so significantly as to change our basic reproduction. [0]: https://watermark.silverchair.com/151663.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAkMwggI_BgkqhkiG9w0BBwagggIwMIICLAIBADCCAiUGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMNDbyu9VK0lVH1VRPAgEQgIIB9nVdpx5WY2VFTM3siR6zUpI0NIrJ8G9sLgHflEENvKJn66C3kpwvmovR88zIGT4Zf1EjM37ovBkwyBefyQUyxX2tV9MlM9OHvTxWrEG41Otg_iehqYE75eFXqRmaREkeDxT_ISS78RZiRXb-i6WkAIIleISQsmOwkTX_aGVOTOkFKNtHYQXN69Db-DMkH_Qh_wtjf6TLPgDfnShgZ8_YwcfGThvT1EwSpazZAHxh82Bfn8zKsfuwaEsObTJsVAuYACQcigL0RYheX7RHBn42fW2eq6IdG6702SQWhlpEfeTuez0kPQ-r-Jh44nomPMhRLMZMtXrtYVkXfDFCs3m1le7xk9YLjvNKZDdJ-LvJwtp9ouuvl1cQajuaSPN6VI5sD2SjGkd5NDs1CAaODx9hwmhKL-6S_WyMlktkw9keaDWvnIRyjLjiTO1AOHs_eURKqxutChnO9xeQYOwKjgJBrT5vt9hMPao9Weab89ykbOwiApEo4NGBAxHY4PGdgm8K_1O8N18g_De-fFCTeY7gMp0OYbWDAxEMRLrKNdTl1ON9sAU488gm7D6FHCQ71yPmc5ucl_aVoTm4sb85QLxJykbamXeBKCIr40bB_0M59bG37P1swc6dWvojGic6c5Vqr9HwB-ItUGp8afq2_zBBOMBTV7Ih4FU https://watermark.silverchair.com/151663.pdf?token=AQECAHi20... [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541191/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541191/ [2] https://bmjopen.bmj.com/content/4/4/e004514 https://bmjopen.bmj.com/content/4/4/e004514