Boris Johnson will become just the fourth British prime minister in 170 years to welcome a baby while in office.
On Saturday, it was announced Mr Johnson and his partner Carrie Symonds were expecting a child early this summer.
The couple, who live together on Downing Street in London, also revealed they are engaged.
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While Mr Johnson will not be the first prime minister to welcome a baby while in office, he joins a very small group of politicians who have done so.
The 55-year-old will become only the fourth prime minister in more than 170 years to have a child while in his senior position, following David Cameron , Tony Blair and Lord John Russell .
Furthermore, Ms Symonds will become the first partner of the serving prime minister in Downing Street to become a first-time mother.
“Many of you already know but for my friends that still don’t, we got engaged at the end of last year... and we’ve got a baby hatching early summer. Feel incredibly blessed,” Ms Symonds wrote on Instagram to announce her pregnancy.
Preceding Mr Johnson, here are the other former prime ministers of the UK who welcomed children while sitting in office:
David Cameron
David and Samantha Cameron with baby daughter Florence Rose Endellion outside 10 Downing Street on 3 September 2010 (Photo by Dan Kitwood/Getty Images)
In August 2010, then-prime minister David Cameron and his wife, Samantha Cameron, welcomed the arrival of their daughter, Florence Rose Endellion Cameron.
Florence was the couple’s fourth child, born just a few months after Mr Cameron’s Conservative Party entered a coalition with the Liberal Democrats, led by Nick Clegg.
The Camerons’ first child, Ivan Reginald Ian, was born in 2002. Born with cerebral palsy and a severe form of epilepsy, Ivan passed away at the age of six in 2009.
Their daughter Nancy Gwen was born in 2004, while their son Arthur Elwen was born in 2006.
Following the birth of Florence, Mr Cameron became the first British prime minister to take statutory paternity leave, having been introduced for the first time in the UK in 2003.
Tony Blair
Tony and Cherie Blair with son Leo at 10 Downing Street on 21 May 2000 (Getty Images)
When Leo Blair was born to Tony and Cherie Blair in 2000, he became the first legitimate child of a serving prime minister to be born in more than 150 years.
The baby took his name from Mr Blair’s father, Leo Charles Lynton Blair, who was a British barrister and law lecturer at Durham University.
Leo is the couple's fourth and youngest child.
Their first child Euan was born in 1984, their second son Nicky was born in 1985 and their daughter Kathryn was born in 1988.
In her 2008 memoir Speaking for Myself , Ms Blair revealed Leo was conceived while she and Mr Blair were staying at Queen Elizabeth II’s estate house Balmoral in Scotland.
Lord John Russell
John Russell, 1st Earl Russell, pictured on 1 August 1861, between his two terms in office as prime minister (Photo by Mayall/Hulton Archive/Getty Images)
John Russell, 1st Earl Russell known as Lord John Russell, served as prime minister of Great Britain twice, first from 1846 until 1852 and the second time from 1865 to 1866.
During his first tenure as prime minister, the Whig and Liberal politician welcomed two sons with his wife Lady Frances Elliot-Murray-Kynynmound, the first, George, in 1848 and the second, Francis, in 1849.
Lord Russell had six children in total, welcoming two daughters during his first marriage before his wife, Adelaide Lister, passed away.
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1/50 29 February 2020
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Boris Johnson gestures as he watches a performance during celebrations for Chinese Lunar New Year at Downing Street in London
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42/50 19 January 2020
Joe Root celebrates with his England team mates after taking the wicket of Rassie van der Dussen during day four of the third Test against South Africa in Port Elizabeth. He took a career-best four wickets during the day's play, which saw the home side follow on in their second innings. They trail England by 188 runs going into day five
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Huge waves hit the sea wall in Porthcawl, Wales, as gales of up to 80mph from Storm Brendan caused disruption around the UK
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48/50 13 January 2020
Puppeteers from Vision Mechanic rehearsing with Scotland's largest puppet, a ten-metre tall sea goddess called Storm, in the grounds of the Museum of Flight, East Lothian. Made entirely from recycled materials, it was unveiled ahead of its debut at the Celtic Connections Costal Day celebrations in Glasgow this weekend
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A home flooded after the River Aire burst its banks in East Cowick, East Yorkshire
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2/50 28 February 2020
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5/50 25 February 2020
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Rachel Cox inspecting flood damage in her kitchen in Nantgarw, south Wales, where residents are returning to their homes to survey and repair the damage in the aftermath of Storm Dennis
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AFP via Getty
15/50 15 February 2020
Models present creations at the Richard Quinn catwalk show during London Fashion Week in London
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16/50 14 February 2020
Climate change protesters march through Whitehall, London
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17/50 13 February 2020
Resigned as Chancellor of the Exchequer. Mr Javid’s departure comes just one month before a crucial budget, intended to chart the course for the new government – and makes him the shortest-serving chancellor for more than 50 years
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18/50 12 February 2020
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20/50 10 February 2020
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21/50 9 February 2020
Residents attempt to remove water from their property as the streets flood in Appleby-in-Westmorland, Cumbria, as Storm Ciara hits the UK
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22/50 8 February 2020
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25/50 5 February 2020
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26/50 4 February 2020
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27/50 3 February 2020
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28/50 2 February 2020
Micheal Ward with his Rising Star Award alongside Daniel Kaluuya Baftas
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29/50 1 February 2020
Activists attend an anti-Conservative government, pro-Scottish independence, and anti-Brexit demonstration outside Holyrood, the seat of the Scottish Parliament in Edinburgh
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30/50 31 January 2020
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31/50 30 January 2020
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32/50 29 January 2020
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33/50 28 January 2020
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34/50 27 January 2020
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35/50 26 January 2020
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36/50 25 January 2020
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37/50 24 January 2020
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38/50 23 January 2020
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39/50 22 January 2020
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40/50 21 January 2020
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41/50 20 January 2020
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44/50 17 January 2020
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45/50 16 January 2020
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EPA
46/50 15 January 2020
Vehicles negotiate the flooded B4069 road at Christian Malford in Wiltshire after the river Avon burst its banks
PA
47/50 14 January 2020
Huge waves hit the sea wall in Porthcawl, Wales, as gales of up to 80mph from Storm Brendan caused disruption around the UK
PA
48/50 13 January 2020
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49/50 12 January 2020
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50/50 11 January 2020
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He then had four children during his second marriage.
Following the death of his eldest son Lord Amberley in 1876 and his daughter-in-law Katharine Russell two years prior, Lord Russell and his second wife raised the couple’s children.
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