What to Do When a Child Vomits, Sleeps a Lot, and Is Lethargic and Crying?

The child is 10 months and 1 week old. This morning, the child started crying and vomiting, with the vomit being sticky and sour, containing milk residue. The parent described the child as possibly having caught a cold or indigestion. The doctor suggests undergoing a routine blood test and an emergency department ultrasound, and paying attention to staying warm and diet. At the same time, one can try drinking small amounts of ginger-sugar syrup several times to alleviate symptoms.
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