Quite a few people have asked me what the newborn Prince George of Cambridge’s coat of arms will look like. The answer is: it won’t look like anything. At least not until he is 18. A coat of arms is devised for royal children when they come of age. Prince George won’t be 18 until the year 2031 by which time he may find himself in a very different position from being third in line to the throne. So, it’s a moot point until then.
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EXARANDORUM 
Does the Infanta Leonor have a coat of arms?
i do not believe she does yet.
While I agree that Prince George will not receive his coat of arms until 2031 when he turns 18, we can still have a little fun and speculate a bit. Prince George’s arms will be influenced by his position in the year 2031, but there are certain basic parameters that help us. First and foremost, Prince George is a direct male member of the British Royal family and as such his base coat of arms will contain the Royal Arms of the United Kingdom, described as follows:
“Quarterly, 1st and 4th Gules three lions passant gardant in pale Or armed and langued Azure (for England), 2nd quarter Or a lion rampant within a double tressure flory-counter-flory Gules (for Scotland), 3rd quarter Azure a harp Or stringed Argent (for Ireland).” Now, for the differences based on his position in the year 2031.
1. If Prince George is 2nd in line to the throne behind his grandfather Charles and father, William, the Royal Coat of Arms will still be used with the addition of a label of three points Argent, with the center point possibly charged with an Acorn, Gules (for Middleton).
2. If Prince George is 1st in line to the throne behind his father, William, he will likely be the Prince of Wales and his arms will likely look very much like the current Prince of Wales described as follows:
“The Royal Arms of the United Kingdom differenced with a label of three points Argent, and on an escutcheon ensigned by the coronet of the heir-apparent, quarterly, Or and Gules four lions passant guardant counterchanged (for the Principality of Wales). ”
3. And, of course if Prince George is the current monarch, then his arms will be the “Royal Arms of the United Kingdom” undifferenced as originally described above.
Anyway, a lot can happen between now and 2031 but that shouldn’t keep us from using our imaginations and using some well reasoned speculation.
The point that those asking the questions had was whether or not he would make use of the differenced royal arms or have a unique coat of arms.