A tiger cub has died just a few days after it was born at the Sedgwick County Zoo.

The Wichita Eagle reports that the zoo announced the cub’s death Friday. The Amur tiger appeared to be doing well after the birth Sunday. The zoo says the cause of death was internal trauma.

The zoo’s deputy director, Ryan Gulker, says the cub’s mother, Talali, may have stepped on the cub or laid down on it.

He says video surveillance showed no maternal aggression or neglect.