I am trying to figure out the name of this children's book where a boy travels through time to the past and becomes friends with this girl and saves her baby brother from a disease by giving him yellow pills and almost ends up dying of the disease instead. He travelled by twisting a knob on a cradle or something similar

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    Probably not a lot of help, but the yellow color of the pill makes me wonder if they're thinking of sulfa drugs, early antibiotics – FuzzyBoots Sep 19 '14 at 20:30

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