The band consists of vocalist Daniel Kost, guitarists Alexander Rudenshiold and Winston Givler, bassist Kyle Guerra, and drummer Austin O'Rourke.

Infant Island was formed in the summer 2016 by vocalist Daniel Kost, guitarist Alexander Rudenshiold, bassist Kyle Guerra, and drummer James Rakestraw.

In February 2019, Infant Island was featured in The Washington Post, along with contemporaries Vein and Portrayal of Guilt, as delivering "new life" to screamo.

[7] On April 17, 2020, Infant Island released the second single for Beneath, "Stare Spells", along with a previously unannounced "mini-LP" titled Sepulcher to positive reviews.

[2][5] In 2018, after the release of their self-titled album, Stereogum's Chris DeVille described their style as "Deafheaven reframed in the sonic palette of Diary-era Sunny Day Real Estate".