In general, the 13-valent pneumonia vaccine is also effective with only one dose, because children who have been vaccinated will produce protective corresponding antibodies. This is a good preventive measure against infections caused by these pathogens in children, and only one dose is effective. However, for better preventive effect, the vaccine is usually given several times. If a child receives multiple doses of 13-valent pneumonia vaccine, the concentration of protective antibodies in the child’s body will be very high and will be maintained for a longer period of time, thus making the protective effect more reliable and accurate. Therefore, only one dose of 13-valent pneumonia vaccine for children is also effective, but try to follow the standard number of vaccinations.