A Washington state couple allegedly starved their baby by putting laxatives in her bottle to prevent her from becoming fat, KING 5 News reported.

Samuel and Brittainy Labberton of Bellevue, Wash., have been charged with third-degree criminal mistreatment; they deny any wrongdoing.

According to court documents, the Labbertons' baby, identified only as "A.L.," was born in August 2008 and was hospitalized less than two months later when she didn’t gain enough weight.

At the time, the Labbertons told doctors that A.L. was "fussy and threw up." But doctors said A.L. appeared happy when they were caring for her.

Court documents state that when A.L. grew to 13 pounds, 7 ounces in December 2008, Brittainy Labberton said, "Oh, my God, she’s fat," and "I have a fat baby."

"I was so concerned she was gaining the weight so fast, I didn’t care that she was gaining weight," Brittainy Labberton said, according to the court papers. "That’s fine. But too fast, it scared the crap out of me."

The baby and her older sister have been removed from their home and put in foster care. The Labbertons have supervised visits.

Prosecutors said test results indicate the Labbertons gave A.L. a laxative in her bottle during one of their supervised visits this past month.

Click here to read more on this story from King5.com.