Is it really true that babies have a different sort of cry according to their different needs?

Technically it is true but although I am a sahm and my baby is 7+ months, I can't really tell too - except do for the desperate ones of hungry and sometimes they can calm themselves by suckle their thumb if they need comfort but u are not there immediately. It's true because the tempo and the urgency n pitch of cry is different, and there are 5 common sounds in the babies cries for different physical needs. That's how some of those crying deciphering device works

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somehow yes. my girl cries differently when she's tired and hungry, or simply want to be picked up and play with. (: