"I pressed a pillow on my son who was lying on his back. For 15 minutes, I pressed down on the pillow without lifting it up," his statement read, according to the publication. "My son was struggling during that time."
"After he stopped moving, I lifted the pillow. Then I yelled for doctors to help to draw any suspicions away from me."
He told police that he was confessing after his guilty conscience got the better of him. He said his wife and his father were both unaware he had murdered the child.
When asked why he did it, Toktaş replied he "didn't love him."
"I never loved my younger son after he was born. I don't know why I don't love him. The sole reason why I killed him that day is because I didn't like him."
He insisted to police that he did not suffer with mental health issues, and that he didn't have a problem with his other son or his wife.
Toktaş, who plays as a defender for club Bursa Yıldırımspor, was arrested and is due to stand trial for murder; if found guilty he could be jailed for life.
Authorities have ordered Kasim's body to be exhumed for autopsy.