Note: Dr. Cogan, our pediatric diabetologist, kindly answered this but was unable to post directly. So this advice is not a random expert on this site!
First how old is your baby? If she is less then 6 months old, you should have a permanent neonatal diabetes work up. Secondly, does she have any other known medical problems? Third, you should check her for ketones, since vomiting is a symptom of high ketones. You can check ketones with either a precision meter, or collecting urine in a cup by squeezing the diaper and then use a dip stick. If vomiting persists she needs further evaluation.
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