Babies born on the same day as the Royal baby are to be given a 'Lucky Silver Penny' struck with the year of their birth.
Llantrisant Royal Mint is making 2,015 pennies struck with the new effigy of Her Majesty the Queen to mark the birth.
The gift will be amongst the first coins to bear the latest Royal portrait.
To mark the birth of Prince George, the Royal Mint gave 2,013 Lucky Silver Pennies to babies born on the same day and also struck a limited edition £5 coin in his honour.
Parents wanting to claim their Silver Penny will have to visit the register the birth of their child on the Royal Mint's Facebook page.