If it is a domestic baby bird, it is best to send it to a professional pet hospital or animal shelter, and professionals will take care of it. Don't try to feed yourself or raise yourself, because it is easy to have problems such as malnutrition and abnormal growth. At the same time, it is not only illegal to treat wild bird cubs as pets, but also inconsistent with the ethics of pet keeping.
In a word, saving young birds is a kind of kindness, but it needs to be carried out in accordance with the correct methods and procedures. In order to ensure their health and life safety, we need to abide by relevant laws, regulations and professional knowledge.