How long after vaccination can an infant take a bath?

Generally, infants can take a bath 24 hours after receiving a vaccination. The detailed explanation is as follows:

The injection leaves a tiny puncture wound on the skin. Waiting 24 hours allows the puncture site to mostly close, reducing the chance of moisture or residual bath products entering the wound during bathing, thereby lowering the risk of localized redness and swelling, inflammation, and other infections. At the same time, after the vaccine enters the body, the immune response is activated. Keeping the injection site dry and clean initially can reduce external irritation during the immune process, helping the body generate antibodies more effectively and ensuring the vaccine's effectiveness.

When bathing, note the following: control the water temperature between 37-40°C to avoid excessively cold or hot water irritating the infant's skin; gently avoid the injection site during bathing and do not rub forcefully; after bathing, gently pat the body dry with a clean towel, paying particular attention to keeping the injection site dry; if slight redness and swelling occur at the injection site, appropriate cold compresses may help alleviate symptoms. However, if the redness and swelling persist or worsen, discharge appears at the injection site, or the infant develops a fever, medical attention should be sought promptly.