The UK's leading disability charity wants a 68-year-old councillor to resign over his "insulting, demeaning and disgusting" comments.
Cornwall councillor Collin Brewer has compared disabled children to deformed lambs that need to be culled.
"[Mr] Brewer said children with disabilities should only be allowed to live after the cost has been evaluated - much like farmers who kill the runt of the litter," the Daily Mail has reported.
"Independent Mr Brewer stood down earlier this year after he claimed disabled children could be put to death to save taxpayers' money.
"He later apologised and quit the council - but then won back his seat in this month's local elections."
It is understood that Mr Brewer told the Disability News Service that runt lambs were often put down by farmers by "smashing them against a wall".
"If they [farmers] have a misshapen lamb, they get rid of it. They get rid of it. Bang," he said.
Mr Brewer reportedly discussed his previous comments with a farmer who made it clear he "didn't see a lot wrong with what I said, because it is something they do every day".
"We are just animals. He obviously has got a point - you can't have lambs running around with five legs and two heads," Mr Brewer said.
"It would be put down, smashed against the wall and be dealt with."
The UK's leading disability charity, Mencap, has called on Mr Brewer to resign from his position on the Cornwall Council.
"We have asked him what he means by these insulting, demeaning and disgusting comments, and whether he intends to meet local groups representing disabled people to reassure them," a Mencap spokesman said.