The reasoning of why birthdays are not celebrated are due to the beheading during the two instances that Jw's bring up in the Bible.
Here is what I bring up, based on the fact that a couple fellows were beheaded during a birthday, we can conclude with the same logic that anything that the end result is a beheading is evil and should be shunned. right?
Now I have two young children at home who take naps every now and then. Are afternoon naps ok? Surely they are not!!!! Those are evil according to the reasoning of a beheading!
2 Samuel 4:5 " So the sons of Rimmon the Beerothite, Rechab and Baanah, departed and came to the house of Ish-bosheth in the heat of the day while he was taking his midday rest. 6 They came to the middle of the house as if to get wheat, and they struck him in the belly; and Rechab and Baanah his brother escaped. 7 Now when they came into the house, as he was lying on his bed in his bedroom, they struck him and killed him and beheaded him ."
This is just an example of the inconsistancy in logic. No mother would/or could refuse their child a nap.