An answer for which I do not have a source, but is worth consideration, is that the sound "shhh" is soothing to babies, perhaps because it imitates the sounds in the womb.
Onomatopoeia can be more or less conventional. Some, like bang, have already acquired word status and their orthography and meaning is fixed. Others, like sh and mm-hmm and its orthographic variants (shhh, shush, etc.), vary within a certain predictable frame (e.g. shosh is not possible for the meaning "be quiet!", but sh-sh is).
I said shshshsh! I know I could say shush, but there are times when I really have to say shshshshsh. What would be the best way of writing this. Maybe Shhhhhh?
Shush usually means to make a "shhhh!" sound, and can be accompanied by a finger to the lips. If your text doesn't absolutely have to mention the finger gesture explicitly, shush as a verb fits well here, especially with secret: During conversation with my uncle, he was telling me their future plans to sell house but my Aunt secretly shushed him.
Observer: Inside the Art World’s Latest Scams: Fake Profiles, Fraudulent Consignments and Digital Impersonation
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