Putin has wished good health to the newborn, Duchess of Cambridge and all the members of the royal family.
The Duchess of Cambridge Kate, who welcomed a baby boy and future King at 4:24 pm BST (03:24 GMT) on July 22, will remain in hospital as she and her husband Prince William want to spend some time alone together.
Surprisingly, no family visitors were expected last night - not even the Middleton family - as the couple want to spend some time alone together.
The as yet unnamed baby weighed in at 8lbs 6oz. He will be given the title His Royal Highness and be known as Prince (Name) of Cambridge.
The new prince is third in the line of succession, displacing Prince Harry to fourth and the Duke of York to fifth, although he may not become sovereign for half a century or more.
Recent legislation allowing female heirs to automatically accede to the throne if they are first born will clearly not affect the Cambridge’s son, but will have a bearing on any of his children.
News of the royal birth - which came after an 11 hour labour - was not made public by Kensington Palace until 8.29pm BST (07.29 GMT) last night, four hours after the baby was born.
Sources said the couple "just wanted to spend a little time together to bond as a family" and inform members of both families privately before the news was disseminated to the world. William made those calls personally.
The Queen, who arrived back at Buckingham Palace just after 3 pm BST (2 pm GMT) yesterday, declared herself "delighted".
Leaders of the three main political parties in Great Britain have extended congratulations to the Duke and Duchess of Cambridge, William and Kate, on the birth of their son. "I am delighted that the Duke and Duchess have a son. His birth is celebrated across the whole country; they will be wonderful parents," - said the Conservative Prime Minister, David Cameron.
The family also received congratulations from Deputy Prime Minister, leader of the Liberal Democrats Nick Clegg, and Labour leader Edward Miliband.
Earlier, members of the royal family voiced their congratulations to William and Kate on the birth of the heir.
Duchess of Cambridge Kate Middleton delivered a baby boy into the world. Prince William and Kate’s baby is the Queen's third great-grandchild and Prince Charles' first grandchild. The boy is automatically in line to the throne.
Kate Middleton was admitted to London’s St. Mary’s Hospital at about 6 am (05:00 GMT) this morning. William and Kate claimed they had had no idea about the baby’s sex before it was born.
On December 3, 2012 it was announced that the Duchess was expecting her first child, and on January 14, 2013 it was announced the child is due in July 2013.
The baby will be third in line to succeed its great grandmother Queen Elizabeth II, the head of state of the United Kingdom and 15 other Commonwealth realms, including Australia and Canada.
The baby will follow its grandfather Prince Charles, the heir to the throne, and its father Prince William, the eldest child of Charles and the late Diana, princess of Wales.
Once all the realms have passed the legislation, male primacy will be brought to an end, backdated to October 2011.
Prince William's wife Kate gave birth on Monday to a boy, who becomes third in line to the British throne, ending weeks of feverish speculation about the royal baby. The couple's first child was born at 4:24 p.m. (1524 GMT), weighing 8 lbs and 6 oz. His name will be announced at a later date but bookmakers favour George and James.
Buckingham Palace said in a statement: "Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 4.24pm. The baby weighs 8lbs 6oz.
"The Duke of Cambridge was present for the birth.
"The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news.
"Her Royal Highness and her child are both doing well and will remain in hospital overnight."
A Buckingham Palace spokesman said: "The Queen and Duke of Edinburgh are delighted at the news."
The new royal baby, third in line to the throne and a future king, is the Queen's third great-grandchild.
If the baby follows after the Prince of Wales and the Duke of Cambridge as king, he will be the 43rd monarch since William the Conqueror obtained the crown of England.
The baby's uncle, Prince Harry, now moves to fourth in line to the throne, while the Duke of York shifts down to fifth and Princesses Beatrice and Eugenie to sixth and seventh place.
The last time a still-serving monarch got to meet a great-grandchild born in direct succession to the crown was nearly 120 years ago.
All media eyes are now on Prince William and his wife the Duchess of Cambridge in the anticipation of Kate’s delivery, as she was sent to London’s St. Mary’s Hospital early on Monday. Her pregnancy was confirmed by the Buckingham palace last December.
· Kate and William’s first baby, girl or boy, will automatically be in line to the throne.
· Kate and William claim they have no idea about the baby’s sex.
· Kate is expected to give birth in London’s St. Mary’s Hospital.
On July 14, some media reported that the baby had arrived, claiming that Prince William was spotted at the hospital due to his plans to be present in the delivery room with Kate. Reporters said the couple had a son.
The Buckingham Palace could not be reached for comments.
This year’s royal birth announcement tradition was adjusted for the Duke and Duchess of Cambridge’s firstborn, The Palace said.
· The Queen will be the first to know about the baby’s arrival.
· According to The Daily Mail, once the baby has been safely delivered, Prince William will call the Queen on an encrypted phone.
· At the same time, the Royal couple’s private secretary, Jamie Lowther-Pinkerton, will inform Prime Minister David Cameron and a small number of top-ranked officials, as well as the Archbishop of Canterbury.
· Back at Buckingham Palace, officials will notify the head of each of the 54 Commonwealth countries and the First Ministers of Scotland, Wales and Northern Ireland.
· For the public, an official notice announcing the birth and the baby’s sex will be placed in a glass-fronted easel and attached to the gates of the Palace.
· A formal notice will be printed up on cream-colored Buckingham Palace letterhead, signed and sealed by the St. Mary’s medical staff. It will then be handed to a royal press officer.
· The officer will be police-escorted to Buckingham Palace, where the announcement would be read to the Queen and other royals. Only then it will be displayed on the Royal Baby Announcement Easel.
· After the easel is displayed, there will be 41 cannons fired from the Tower of London and Green Park.
· Close friends of the Royal Couple will see the newborn in hospital.
· The Queen will be waiting for the baby to be delivered to The Palace.
· After the announcement goes onto the easel, a press notice will be dispatched, and it’s expected to be placed on The Palace’s official webpages.
· Electronic announcement will bear the same legal force though it only complements the traditional procedure by no means substituting it.
Will a new baby be an heir to the throne?
Traditionally, the firstborn male is the next heir to the British throne, but this royal child will be next in line thanks to a change in the rule of primogeniture agreed to by the 16 nations of the Commonwealth,
In line with the 1701 Act of Settlement, the crown passed to the eldest son and was only bestowed on a daughter when there were no sons.
All this changed in October 2011, when the leaders of 16 Commonwealth unanimously agreed to amend the succession rules.
The leaders unanimously agreed that sons and daughters of British monarchs will have an equal right to the throne. They also agreed that a future British monarch can marry a Roman Catholic -- something that was banned by The Act of Settlement.
 The changes mean that Prince Charles's eldest sibling, Anne, might be in line to the throne in front of her younger brothers Andrew and Edward.
The UK is being somewhat old-fashioned in the issue while Sweden, Norway, Belgium and the Netherlands have already progressed to gender equality in their royal succession rules.
Voice of Russia, RIA, telegraph.co.uk, mirror.co.uk, Reuters, the Daily Mail, Interfax