How a Fat Boy is Making his Own Defense

A fat boy is making his own defense

My boy is getting fatter and fatter over a few months. He is making his own defense to say...

I always a positive boy with my head up as my double chin cause my head down difficult.

I'm not fat. I just feel hot and inflate of being like a balloon. The teacher told me hot air would inflate the balloon to get round shape.

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Mom, everything would eventually get better.  I start from a little bit fat and eventually get fatter now.
 
I've gone through a lot of things such as happiness, insane, and sorrow. But why I haven't gone through of being lean?
 
I love to eat donuts. That is why it sticks around my belly!!
 
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I can't get what he is talking about, as usual.