The first baby to have been born with antibodies is based in Singapore.
However, as Reuters and other media outlets have noted, a mother in Singapore had given birth to a baby with antibodies against the virus in March 2020. The mother said that her doctor suspected that she had transferred her COVID-19 antibodies to the baby during her pregnancy after she had contracted the virus.
Doctors in China published research on six pregnant women with confirmed COVID-19 cases. It was revealed that all six infants had antibodies, and all had negative RT-PCR test results in 2020 and 2021.
The baby in the U.S. was the first known infant to be born with antibodies after the mother received the vaccine, but the first baby born with antibodies was in fact in Singapore, as its mother had been infected with the virus.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.