The seven Labour MPs who defied the Government by backing an amendment to scrap the two-child benefit cap have lost the whip, the PA news agency understands.
Apsana Begum, Richard Burgon, Ian Byrne, Imran Hussain, Rebecca Long-Bailey, John McDonnell and Zarah Sultana have been suspended from the parliamentary party for six months, after which their position will be reviewed.
Prime Minister Sir Keir Starmer faced his first Commons rebellion on Tuesday as the Government comfortably defeated calls to scrap the cap.
But the division list showed seven MPs rebelled to back the SNP-led amendment.
More than 40 Labour MPs recorded no vote, with some of those listed spotted in the chamber throughout the day, while others will have had permission to miss the vote.
The House of Commons voted 363 to 103, majority 260, to reject the amendment tabled in the name of SNP Westminster leader Stephen Flynn.
Slow handclapping could be heard in the chamber after the result was announced.
The cap, introduced in 2015 by then-Conservative chancellor George Osborne, restricts child welfare payments to the first two children born to most families.
Mr Flynn said: “Tonight, the Labour Party has failed its first major test in government.
“Labour MPs had the opportunity to deliver meaningful change from years of Tory misrule by immediately lifting thousands of children out of poverty – they have made a political choice not to do so.
“This is now the Labour government’s two-child cap – and it must take ownership of the damage it is causing, including the appalling levels of poverty in the UK.”
Ahead of the vote, Prime Minister Sir Keir Starmer said there is “no silver bullet” to end child poverty but acknowledged the “passion” of Labour MPs who were considering rebelling over the continuation of the Tory measure.
Related: Slow handclapping heard as call to scrap two-child benefit cap defeated