I know this is a 8 year old thread, but I was searching for reasons my normally happy baby started becoming fussy, had to be held, and was constantly grunting, and I run across this thread. Turns out she had two ear infections. She also was having trouble sleeping and wasn't interested in eating. She wasn't crying at all, just fussy, unhappy, and grunting.

I wonder if the original baby in question had some sort of underlying infection - yeast, UTI, ear, etc. and was generally "mellow" and therefore their experssion of pain was just fussiness/grunting.

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