It is not a big problem for babies to eat fish in small quantities after vaccination, but it is not recommended to eat large quantities of fish as well as fish for babies with allergies who have just been vaccinated. Babies may have poor appetite, nausea, vomiting, bloating and other adverse reactions after vaccination, and in severe cases may have a fever. At this time the baby small amount of fish is not a big problem, but it is not recommended to eat a lot of fish, so as not to aggravate the burden of the gastrointestinal tract and so on. In addition, fish is rich in protein, but for the human body belongs to the foreign protein, may induce allergic reactions, so allergic babies are not recommended to eat fish just after vaccination. After vaccination, babies should drink more water, eat less and more meals, and are advised to eat foods that are easier to digest. If the baby’s vaccine reaction is more intense, parents should take the baby to the doctor in time to avoid serious consequences.