Norwich MP Chloe Smith's baby Alastair made history as first infant of a Conservative MP to be taken into the House of Commons chamber.
The Norwich North MP, who returned from maternity leave to take part in the vote, took her four-month old through the voting lobby, where he also met Prime Minister Theresa May.
Ms Smith and her husband Sandy McFadzean's son Alastair Hugh was born last September.
'Whichever way you look at it, this was a bit of history and it'll be a privilege to be able to tell our son he was there,' Ms Smith said.
She was told he was one of the first babies ever in the Chamber by Speaker John Bercow, who gave her permission to bring in the infant.
It is believed that only a Liberal Democrat and a Labour baby have previously been in the House of Commons chamber before.
Parents have spoken out in the past about the fact that parliament is not geared up for young families.
MPs do not automatically get maternity leave as they are classed as self-employed and have to negotiate leave with party whips.
Working hours have improved in recent years, although the House still sits until 10.30pm on Mondays and on Tuesdays and Wednesdays until 7.30pm.
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