This is a very good question which you have set out well.The cause of your baby's vomiting 4 weeks ago is not obvious but sounds as if she may have had tonsillitis.Her second illness started 2 weeks ago and she has had a high fever until now. Her illness sounds like Roseola or baby measles. Now that the rash has appeared her fever will settle. The rash will disiappear after a maximum of 3 days. If you are allergic to penicillin it is possible that your baby is also allergic and this may be the reason why she vomits antibiotics.
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