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The photo, which shows part of Stormi’s face with her tiny hand wrapped around her mother’s thumb, garnered more than 3 million likes in 30 minutes.
Jenner, 20, kept her pregnancy private, choosing not to comment on reports that she and boyfriend, rapper Travis Scott, 25, were expecting. Stormi’s last name is Webster, after his rapper father, whose real name is Jacques Webster.
Related: Kylie Jenner gives birth to baby girl
Jenner announced Stormi's Feb. 1 birth in the form of a nearly 12-minute-long YouTube video titled "To Our Daughter" on Sunday. The video was followed up by an Instagram statement in which Jenner thanked fans for being understanding of her decision to keep the pregnancy private.
Stormi is the first child for Jenner and Scott.