Generally a healthy child is one that is less likely to be susceptible to any diseases or sicknesses that may be going around at the time. Most children are able to live a happy and healthy life with the help of a good diet plan and the daily physical activity that will help them function optimally both mentally and physically.
Keeping the child healthy is really the responsibility of the parent as is teaching the child to adopt good habit that will help keep the child from being unnecessarily exposed to anything unhealthy.
However should there be a need to address any less than desirable health conditions, it may be prudent to seek medical advice at the earliest possible stage.
There are also possibilities of using a more holistic approach to treating mild infections as it is not always good to pump a child with pills and medicine that may have long term residual side effects.
Besides a healthy diet plan that is nutritionally balanced, the parent would also need to teach the child good hygiene habits. This should be practiced both at home and away from home.
Good hygiene will also help to ensure the child is not left susceptible to negative elements through habit that may encourage such prevailing circumstances.
Simple actions such as washing hands before meals and also when using public facilities, will go a long way in helping to keep the child safe from being exposed to germs. Children should also be taught to avoid sharing meals with those having any kind of infections.