Origin of Birthday Cake: Europeans in the Middle Ages believed that birthdays were the day when souls were most easily invaded by demons, so on birthdays, relatives and friends would gather around to give their blessings and send cakes to bring good luck to drive away demons. Birthday cake, originally only the king was entitled to own, can buy a beautiful cake on his birthday and enjoy the blessings given by everyone.
The origin of the full moon cake: when the baby is full moon, it is inevitable to pray to God for ancestor worship and then shave the fetal hair. Adults always hope that the baby will grow up quickly. On the day of the full moon, grandparents will send many full moon cakes to the baby, hoping that the grandson (female) will win the first prize and have a full life. With the progress of the times, giving cakes at the full moon means "puffing", wishing the baby a prosperous future.