I don’t know what you were reading, but it sounds like it was a poor source of information. No one is born with math skills. Barring a disorder of some kind, the differences in innate intelligence at birth are so small that they are rapidly overtaken by life experience and training even fairly early in grade school. The moral here is that, according to cognitive psychology research, intelligence and related skills (like math skills) are not immutable and can be trained like any other skill.
Source: [Brown, Roedinger, McDaniel. 2014. Make It Stick: The Science of Successful Learning. Belknap Press. ISBN: 978-0674729018](https://www.amazon.com/dp/0674729013/ref=cm_sw_r_cp_apa_KrvaCbMSC0S6H)