Generally speaking, people eat eggs on birthdays. The specific meaning is as follows: from the shape, the egg is round and can roll. There is a saying in the countryside that eating eggs can "roll disaster". Eating one for a child's birthday means that this year is as perfect as an egg, symbolizing taking away disaster and bad luck. In addition, chicken is a kind of animal that is relatively easy to raise compared with other animals. Since ancient times, there have been more people raising chickens than other animals. Therefore, people have long known that eggs are nutritious. Moreover, now that women are confined or sick, relatives and friends also send more eggs. From the outside, it is auspicious, pleasing and nutritious. The habit and law of eating eggs slowly are forgotten.
The following contents are for reference: Baidu Encyclopedia-Eggs