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After the baby is one year old, parents may sometimes observe that the child seems to be more susceptible to illness and his resistance seems to be reduced. There are scientific reasons behind this phenomenon, mainly related to the development of the baby's immune system, the gradual disappearance of maternal antibodies, and changes in the living environment.

### Reduction of maternal antibodies

In the first few months after birth, babies rely mainly on antibodies obtained from their mothers to fight off disease, which are passed across the placenta and continue to be obtained through breast milk after birth. However, as babies grow older, the concentration of these maternal antibodies gradually decreases, especially around the age of one year, when the protective effect of maternal antibodies will significantly weaken. At this time, the baby's own immune system needs to take on more of the task of defending against foreign pathogens.

### Immune System Development

The baby's immune system will gradually develop after birth, but it is not until the preschool period that the immune system approaches adult levels. This means that in the years from one year old to preschool, the baby's immune system is still maturing and its resistance to disease is relatively weak. Babies at this stage are more susceptible to common childhood diseases such as respiratory diseases and gastrointestinal diseases.