The leader will be announced at the party conference in Torquay, which, according to reports, Nigel Farage will not be attending.
UKIP should not become a one-issue party centred around Islam, the party's leader in the Welsh Assembly Neil Hamilton has said. A former soldier, Bolton is a one-time Lib Dem member who has worked as an European Union common defence strategist.
Henry Bolton began the party's leadership contest as an apparent also-ran in a race which seemed to be between current deputy leader Peter Whittle and hardliner Anne Marie Waters who had described Islam as "evil".
Tatiana Smurova-Bolton gave birth on platform 13 of the St Pancras, a UKIP spokesperson confirmed, and the couple subsequently named their daughter Victoria.
Despite being relatively unknown, the ex-Thames Valley police officer, who joined the party in 2014, is no stranger to running for elected posts.
Numerous senior Ukip figures and most of its MEPs had threatened to walk away if she won. BBC political correspondent Ben Wright said Mr Bolton would be seen as the continuity candidate.
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Under Nuttall the party introduced a so-called "integration agenda" aimed at Muslims, including a proposed ban on wearing a full-face veil in public.
Incredibly, this was Ukip's third leadership election in a year.
He promised to reorganise the party to increase its effectiveness and said he wanted to project UKIP "firmly and decisively into British politics for the good of the nation".
UKIP has already lost a significant number of voters, dropping from 4 million in the 2015 general election to fewer than 600,000 in June this year.
The party has been riven by splits and disagreements, one of which resulted in MEP Steven Woolfe being taken to hospital after a fight with another Ukip MEP. His replacement Dianne James lasted just 18 days and the front runner to succeed her quit the party after an altercation with a colleague left him in hospital. Instead he suffered a hefty defeat in February's Stoke-on-Trent Central by-election and later resigned after leading the party to a disastrous result in the snap general election.
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However, Nemanja Matic is the one giving the most to the stability of this side. "I know it is not easy". However, Coates doesn't see it as a problem because teams can not be forced into selling their players.