Melaka Tengah police chief Christopher Patit said the injuries were likely caused by the physical pressure on the child which made it difficult for the baby to breathe.

“The post-mortem classified the case as ‘pending laboratory investigation’ and several samples have been taken for toxicology testing at the Melaka chemistry department,” he said in a statement today.

A post-mortem of the baby’s father, Nuruleffendy Ibrahim, 35, found a blockage and two closed heart valves, but no other physical injuries. The cause of death was classified as ischemic heart disease.

The baby is believed to have been accidentally pinned under his father’s arm after the latter suffered a heart attack at their home in Kampung Perigi Hang Tuah here yesterday morning.

The victim was found unconscious by his mother, Azura Abdul Malik Yaher, 37, who had returned home to take the youngest of their three children for a routine jab at a clinic.