The generous star, 25, gave the money to a fund set up for 13-month-old Ayden, who is the nephew of Kim 'Toshi' Davidson, one of Taylor's dancers on her '1989' world tour, and also left a message on the GoFundMe page set up to help him.
"Baby Ayden, I'm lucky enough to perform with your uncle Toshi on tour. All of us are praying for you and your mama and sending so much love your way. Love, Taylor," she said.
"She is such an incredible human being ... This will help Lil Toshi in this time of need... Let's pray for him to beat this ... This unexpected gift is truly a blessing.