JAMA
March 15, 2022, Vol 327, No. 11, Pages 1011-1100
https://jamanetwork.com/journals/jama/currentissue

Durability of Anti-Spike Antibodies in Infants After Maternal COVID-19 Vaccination or Natural Infection
Lydia L. Shook, MD; Caroline G. Atyeo, BS; Lael M. Yonker, MD; et al.
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JAMA. 2022;327(11):1087-1089. doi:10.1001/jama.2022.1206
This study compares the persistence of anti-spike IgG titers in infants of vaccinated mothers vs mothers who had been naturally infected with COVID-19.