Media from around the world have been gathering at the exclusive private maternity unit and, when not looking out for signs of a development, have kept busy with even the slightest of quirks.
A small flock of ducks landed to join the crowd, attracting a few photographers, and a car had to stop to allow one to cross the road.
“Mind the duck,” said one concerned onlooker.
Earlier, a vehicle with two giant teddy bears on the back caused a stir — one with a blue badge and one with a pink badge — and two mock guardsmen in red tunics stood at the entrance to the Lindo Wing.
They were brought by bookmaker William Hill, which was announcing the latest odds on baby names.
There is a 500/1 chance that the baby prince or princess will be called Kanye or Taylor, while Brooklyn is at 150/1 and Kim is at 250/1.
The long wait has cost those who like a flutter dear, according to Ladbrokes spokeswoman Jessica Bridge.
She said: “Punters have lost out on thousands of pounds worth of winnings thanks to the April no-show, but their last roll of the dice suggests we’ll see the newborn arrive on Bank Holiday Monday.”
“At 8/1, a general election baby’s not out of the realms of possibility, but it’s probably a safe bet that Kate and Wills won’t opt for a Prince Nigel or Princess Nicola.”
Coral’s Nicola McGeady said: “Punters are becoming increasingly impatient as the Great Kate Wait continues and, while some have given up predicting the date of birth, others are betting on a Star Wars Day [May 4] royal baby.
“The odds of Kate giving birth on the day of the general election are still quite long at 20/1.”
Meanwhile, royal superfans camping outside the hospital are tired after their long vigil on the pavement.
Why would anyone sit outside the Lido wing for a month waiting for a royal arrival. The world has gone mad!— jan howells (@danzyhowells) April 28, 2015
This is the longest John Loughrey, 60, from London, has ever camped out and he thinks it has been 10 or 11 nights — but he has lost count.
The royalist said he is looking forward to resuming “normal life”.
Fellow camper Sky London, 54, said he is losing track of which day it is but remains hopeful: “Since she didn’t turn up yesterday, it has to be today. It’s got to be.”
With each passing police van or blacked-out car, the anticipation goes up a notch.