The Metropolitan Police chief said a campaign launched to identify possible victims of female genital mutilation (FGM) "warns" people of the law.
Sir Bernard Hogan-Howe said: "They have an option to stop - the fact they bought a ticket to me is irrelevant.
"They should not be committing a serious attack on a child and they should not be breaking the law."
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The 18-month-old baby girl was in "excruciating pain" after suffering broken ribs, leg fractures and injuries to her spine, face and neck.
The "world's first transgender doll" has appeared at New York's Toy Fair and will go on sale in July.
The exhibition includes the gown she wore when she danced with John Travolta at the White House and a dress used for a Vanity Fair cover.