Ladbrokes opened a book over which Walford man was responsible for Heather Trott's (Cheryl Fergison) shock pregnancy.
Since it began taking bets, Phil Mitchell (Steve McFadden) was backed into the 1/2 odds-on favourite from 5/1.
The original market leader, Heather's ex-husband Minty Peterson (Cliff Parisi), drifted from 2/1 favourite to 4/1 second favourite alongside Eddie (Will Chitty), the mystery man Heather met in R&R.
Darren Miller (Charlie G Hawkins) remained at 6/1, while Garry Hobbs (Ricky Groves) and Vinnie Monks (Bobby Davro) stood at 8/1 when the book closed. Vinnie's son Callum (Elliott Jordan) stayed the rank outsider for the duration at 16/1.
Barman Billy Mitchell (Perry Fenwick) and Christian Clarke (John Partridge) remained 10/1 shots and Charlie Slater (Derek Martin) stood at 12/1.
A spokesman for Ladbrokes said: "Viewers may be in the dark about the identity of the baby's dad but punters are in no doubt - they fully expect another addition to the Mitchell clan."
Earlier this week, details emerged about the name and true sex of Heather's as-yet-unborn child.
> 'Who's the Daddy?' poll results