Adverse Reactions After Newborn D3 Injection

A newborn received an injection of 300,000 units of Vitamin D3 due to insufficient daytime sleep and poor nighttime sleep quality, as well as frequent movement during sleep. The doctor diagnosed severe calcium deficiency and administered a D3 injection. However, on the tenth day after the injection, the child struggled to fall asleep due to vomiting milk, and vomited three times after each feeding. Sometimes, they would sleep well but wake up due to vomiting, with the situation recurring. Eating also became less than before. Is this a symptom of poisoning? How should we handle it?
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