Earthlings have strange customs.
Newborns are celebrated as lifetime achievements whereby people congratulate each other, that which occurs in the animal kingdom as ordinary events resulting from sexual relations between male and female.
Dogs have babies, cats have babies, pigs have babies, elephants have babies, even mice have babies, all as a result of sexual relations between male and female. It happens all the time in the animal kingdom, day in, day out, without fanfare of any sort. You have sex, the female gets pregnant, a baby is born. Simple as that. What's all the fuss about? What makes it an achievement of a lifetime?
A kingdom may have cause to celebrate the royal birth of a son, an heir to the throne, but who's to say he will rule as wisely as his father did? Who's to say he won't bring about ruination instead? Is celebrating his royal birth not presumptuous in such a case? What about all the illegitimate children sired by the king as happens when a king's sexual appetite overflows from the royal bedroom into the royal harem? Are they celebrated when they are born? Are they not swept under the royal carpet as dirty royal secrets instead?
You have sex, the female gets pregnant, a baby is born. What's so difficult about that? Happens all the time in the animal kingdom, day in, day out, from the largest creature to the smallest. What's all the fuss about?
Another strange custom is celebrating the aging process each year with birthday cakes and party hats from childhood until old age. What's so joyous about indirectly celebrating the onset of inevitable death as people approach it with the passage of time from childhood to old age?
Mighty strange customs indeed hath earthlings.