GAZA CITY, Gaza Strip (AP) — Gaza health officials are casting doubt on initial claims that a 9-month-old baby died from Israeli tear gas fired during mass protests on the Gaza border with Israel.

A medical doctor said Tuesday that the baby, Layla Ghaben, had a pre-existing medical condition and that he did not believe her death was caused by tear gas. He spoke on condition of anonymity because of he was not allowed to disclose medical information to the media.

Layla's family claimed Tuesday that the baby had ended up in the area of the protest as a result of a mix-up. The Gaza Health Ministry initially counted her among several dozen Palestinians killed Monday.

A Gaza human rights group, Al Mezan, says it is looking into the circumstances of the infant's death.

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