Princess Charlotte of Cambridge

Although members of the Royal Family don't usually receive a grant of arms until they come of age (18) I thought it might be fun to celebrate the new royal birth by designing a possible coat of arms for the daughter of the Baron and Baroness of Carrickfergus (the Northern Irish title of Prince William and Kate).
First a little bit about how the variants of the royal arms granted to members of the Royal Family work. Children of the monarch use the Royal Arms of the United Kingdom defaced with three labels, Grand Children of the monarch have five labels. The exception is the eldest heir of the heir apparent (Prince of Wales) who uses three labels. In each individual coat of arms the labels bear distinctive insignia, to differentiate the arms. These can be all sorts of symbols, the most common are anchors, roses, thistles, red lions, red crosses (St Georges Cross), seashells and even hearts. Wives of Princes use the arms of their husband impaled with either the arms of their father or the arms they used before marriage (depending on if she was an armiger or not).

The arms of  Prince William and Kate

The coat of arms of Duke of Cambridge has three labels, the centre one bearing a seashell, the arms of the Duchesse is the same except impaled with the coat of arms of her father.
My first idea was to place the red seashell of her father in the centre label of the Princess' coat of arms, The flanking labels bear the acorn from her mother's arms.

The diamond shape is a lozenge shield, which is usually born by women.
Another proposal uses all three acorns, alternating with hearts:

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