Answer:
I'm tall when I'm young and I'm short when I'm old. What am I?
I am expelled from you orally with a sound
My days are numbered.
In my life I must bare my bloodline I must share.
You use a knife to slice my head and weep beside me when I am dead.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic