The case is the second known account of a breastfeeding baby dying.

A six-week-old breastfeeding baby became inexplicably ill with a high fever after his mother received a COVID-19 vaccine and he died weeks later with blood clots in his "severely inflamed arteries," according to a vaccine adverse event report filed with the U.S. government.

An unidentified 36-year-old woman from New Mexico said she received a first dose of Pfizer's Covid-19 jab on June 4, 2021 when she was breastfeeding her six-week-old infant son, according to a report filed with the Vaccine Adverse Event Reporting System (VAERS).

"On July 17, my baby passed away," says the report, which first appeared on VAERS August 13, 2021.

Blood clots, inflamed arteries

The baby boy became "very sick with a high fever" on June 21 when he was treated with intravenous antibiotics for two weeks in hospital for what was assumed to be a bacterial infection.

The VAERS report says that hospital tests "never found any specific bacteria," and called his diagnosis "culture-negative sepsis." It states that at the end of his two-week hospital stay he tested positive for rhinovirus and was sent home.

At home, the baby developed further symptoms over the following week, including a swollen eyelid, "strange rashes" and vomiting. His mother returned him to the hospital July 15 when he was diagnosed with "atypical Kawasaki disease"