ATLANTA -- A vegan couple were sentenced Wednesday to life in prison for the death of their malnourished 6-week-old baby boy, who was fed a diet largely consisting of soy milk and apple juice.

The couple were found guilty May 2 of malice murder, felony murder, involuntary manslaughter and cruelty to children. A jury deliberated about seven hours before returning the guilty verdicts.

Defense lawyers said the first-time parents did the best they could while adhering to the lifestyle of vegans, who typically use no animal products. They said Sanders and Thomas did not realize the baby, who was born at home, was in danger until minutes before he died.

But prosecutors said the couple intentionally neglected their child and refused to take him to the doctor even as the baby's body wasted away.

"No matter how many times they want to say, 'We're vegans, we're vegetarians,' that's not the issue in this case," said prosecutor Chuck Boring. "The child died because he was not fed. Period."