Is the first birthday ceremony one year old?

No. One year old refers to the age calculated from the date of birth, usually based on the actual age, that is, how many birthdays have passed from birth to the time of calculation. For example, a child born on June 65438+ 10/day in 2022 will be one year old on June 65438+1 0/day in 2023. So the one-year-old ceremony does not mean that the child is one year old, but a ceremony to celebrate the child's first birthday.