You mention she is sick so often but didn't say how often...could it be allergies? At that age they can have a blood RAST test to check. Also, eating normally doesn't seem like a sore throat...what makes you think that's it? Does she grimace when she swallows? My kids have lessened their bottle intake when their ears were infected (sucking causes pressure changes that often hurt more)...maybe you can try formula from a cup. Good luck :-) Hope she feels well soon.
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