She was born with "vascular abnormalities" that required immediate attention and the band asked fans to help raise $2000 to pay for the treatment.

A GoFundMe page set up by Betit has already surpassed that target, bringing in $3100 so far. The surgery included a procedure to remove a growth from little Harper's hip.

Craig Betit says: "Harper's surgery went fantastic. The growth has been removed and the incision closed up. If all goes well we should be back home within 48 hours. Thank you everyone for your thoughts, prayers, kind words, and all-round support."