This is Tim Burtons 'Mummy boy' who can be found in his 1997 poetry book 'The melancholy death of oyster boy and other stories' 

He wasn't soft and pink witha fat little tummy; he was hard and hollow, a little boy mummy.

"Tell us, please, Doctor, the reason or cause, why our gundle of joy is just a bundle of gauze."

"My diagnosis," he said "for better or worse, is that your son is the result of an old pharoah's curse."

That night they talked of their son's odd condition- they called him "a reject from an archaeological expidition."

They thought of some complex scientific explanation, but assumed it was simple supernatural reincarnation.

With the other young tots he only played twice, an ancient game of vergin sacrifice. (But the kids ran away, saying, "You aren't very nice.")

alone and rejected, Mummy Boy wept, then went to the cabinet where the snack food was kept.

He wiped his wet slockets with his mummified sleeves, and sat down to a bowl of sugar-frosted tanna leaves.

One dark, gloomy day, from out of the fog, appeared a little white mummy dog.

For his newfound wrapped pet, he did many things, like building a dog house à la Pryimid of kings.

It was late in day- just before dark. Mummy Boy took his dog for a walk in the park.

The park was empty except for a squirrel, and a birthday party for a Mexican girl.

The boys and girls had all started to play, but noticed that thing that looked like a papíer mâché.

"Look its a píñata," said one of the boys, "Let's crack it wide open and get the candy and toys."

They took a baseball bat and whacked open his head. Mummy Boy fell to the ground; he finally was dead.

Inside of his head were no candy or prizes, jast a few stray bettles of various sizes.