The parents of missing Madeleine McCann have appeared on BBC One's Crimewatch to urge anyone with information of her whereabouts to come forward.
The McCanns hold up a set of pink pyjamas in the broadcast
In the appeal, broadcast at 2100 BST, her mother Kate held pyjamas like those Madeleine was wearing when she disappeared on 3 May in the Algarve.
She said she hoped Madeleine was taken by someone "sad" who will not harm her.
The four-year-old's father Gerry said he believed a sighting of a man on the night of 3 May carries "some weight".
It is thought Madeleine was snatched from the family's apartment in Praia da Luz while her parents were at a nearby restaurant.
In the Crimewatch appeal, Mrs McCann, 38, held up a light-pink pyjama top with capped sleeves and a picture on it of the cartoon character Eeyore, who is curled up with the words "Sleepy Eeyore" written underneath.
She also produced white cotton pyjama bottoms, covered with small flowers and carrying another Eeyore motif on the right leg.
The pyjamas are identical to those Madeleine was wearing and belong to her two-year-old sister Amelie.
Mrs McCann spoke of her hope that her daughter had not been harmed, saying: "The majority of people... are really good people and I think that's been demonstrated by all the fantastic support we've had.
"There are a few bad people in the world but also there are a few sad people and I guess I'm hoping that it's someone sad who just wanted our daughter."
Mr McCann, who turned 39 on Tuesday, gave a detailed description of a suspect seen carrying what was thought to be a child on the night Madeleine disappeared.
He said the man was approximately 35 years old, about 5ft 8in or 5ft 9in tall and had dark hair, which was parted at the side and slightly longer at the back.
He said the man was wearing a dark jacket slightly longer than a suit, beige trousers and dark shoes.
Asked if he thought the man had taken Madeleine, he said: "Potentially this could have been someone who could have been picking up a child from a creche or coming back from dinner.
"But we are certainly suspicious of the timing and that person needs to be eliminated from the investigation.
Madeleine McCann has now been missing for more than a month
"The description has been out for 10 days and as far as we know, no-one of that description has come forward so that definitely gives it more weight."
He also urged people to hand in any pictures taken around the time Madeleine vanished at Praia da Luz with strangers in the background.
He said that more than 1,000 pictures have already been handed in.
Mrs McCann said: "Anyone who was in the area around that time [3 May], even a few weeks before, who hasn't come forward, please do.
"If by any chance somebody knows where Madeleine is, we would obviously urge them to come forward."
The couple have been visiting a number of European countries in an effort to raise the profile of Madeleine's case.
Last week, they appealed for help on Spanish television.
On Tuesday they flew to Berlin in the private jet of an anonymous donor.
The couple have been so preoccupied with finding their daughter that Mr McCann had even forgotten it was his birthday.
"Was it today or yesterday?" he asked on the flight to Berlin. "I can't even remember, it just isn't important."
"Still today," said Mrs McCann.
Before they left, Mr McCann was presented with a large birthday card made by Amelie and her twin brother Sean.
With a little help from their mother, they wrote Happy Birthday Daddy on the front in a bright crayon scrawl. Inside, were the children's names - Sean, Amelie and Madeleine.
During their fleeting visit they were due to meet Deputy Interior Minister Wolfgang Schauble and the Mayor of Berlin, Klaus Wowereit, before heading to Amsterdam, where the couple lived for a year.
There is also expected to be a trip to Morocco, a country which has been linked to the case because of a reported sighting of Madeleine there.