Windsor babies have come in a wide variety of sizes over the past century or so, as our graphic shows - from a tiny 4lbs 9oz to a new arrival at more than twice the weight.
Zara Tindall was joined by her husband Mike, 43, and their three children Mia, eight, Lena, three, and one-year-old Lucas, for the weekend-long event in Norfolk, just a stone s throw from Sandringham.
Father-of-three Mike Tindall had his hands full as he took his children to the funfair while wife Zara competed in the Houghton Hall Horse Trials on Saturday.
Prince William enjoyed a little tomfoolery with Mike Tindall at Houghton International Horse Trials in Norfolk yesterday, while there to support his cousin and Tindall s wife Zara, who had been competing.