https://truthersjournal.com/......./birthday-origins-h

The custom of celebrating one’s birth was considered a pagan practice during the first and second centuries A.D. Because astrology was closely linked with the date of one’s birth, many early church fathers rejected the notion of honoring birthdays because astrology was condemned in the bible (Isaiah 47:13)

After the fourth century, celebrating one’s birth became a common practice, due largely in part to the Romans, who having practiced this custom for thousands of years, began to embrace Christianity.