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Baby cries and fusses after receiving the second dose of hepatitis B vaccine

Feb 25, 2023 Source: Cainiu Health
Dr. Jiang Weimin
Introduction
After receiving the second dose of the hepatitis B vaccine, infants may cry and become fussy due to excessive fear, injection-related pain, discomfort at the injection site, adverse drug reactions, or common colds. The crying after the second hepatitis B vaccination might be related to excessive fear. In such cases, parents can kiss the infant, hold them gently, and offer their favorite toys to distract their attention and reduce fear.

In general, crying and fussiness in infants after receiving the second dose of the hepatitis B vaccine may be caused by excessive fear, injection-related pain, discomfort at the injection site, adverse drug reactions, or colds. The specific causes are analyzed as follows:

1. Excessive Fear

Crying after the second hepatitis B vaccination may be related to excessive fear. In such cases, parents can kiss the infant, hold them close, and offer favorite toys to distract their attention and reduce fear. After vaccination, keep the injection site clean and hygienic; avoid bathing for 48 hours and refrain from scratching the area.

2. Injection-Related Pain

Pain during administration of the second hepatitis B vaccine—possibly due to excessive injection pressure—may cause the infant to cry. It is important to comfort the infant promptly and divert their attention. Crying usually subsides gradually.

3. Discomfort at the Injection Site

After vaccination, redness, swelling, pain, or hard nodules may develop at the injection site. These are normal immune responses. Infants may cry due to this localized discomfort, especially within the first few hours after vaccination.

4. Adverse Drug Reactions

After the second dose of the hepatitis B vaccine, adverse reactions such as vomiting, diarrhea, local redness and swelling, or pain may occur, leading to infant crying. Ensure the infant drinks adequate fluids to promote metabolism; symptoms typically resolve gradually. Monitor the infant closely during this time.

5. Cold (Upper Respiratory Infection)

After vaccination, an infant's immunity may temporarily decrease, making them susceptible to colds, which may cause mild fever. Fever can lead to discomfort and irritability, increasing the likelihood of crying.

If the infant continues to cry persistently or shows signs of severe adverse reactions, prompt medical evaluation at a hospital is necessary.


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