William told the Sandringham crowd: "We've had a good morning with George and I can't wait until next year when he's bigger."
Cicely Howard, 75, from Great Yarmouth, met Kate and asked about the baby.
She said: "She told me he was having a lovely day but was more interested in the wrapping paper than the presents."
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The largest horse chestnut tree in the country declared as the 300-year-old specimen at the estate where PM Benjamin Disraeli once lived.
The fanfare and fireworks at Tattersalls in Newmarket on Friday failed to materialise as three Frankel foals met with differing fortunes