The accused woman was taken into custody earlier this week and the handwritten note has been sent to the Forensic Science Laboratory for examination by handwriting experts.
Though the details behind her son's death remained in dark initially, the autopsy report has now exposed the horror the child went through in the hands of his mother.
On Wednesday, eight Congress MLAs in Goa, including former Chief Minister Digambar Kamat, joined the ruling BJP in the presence of Goa Chief Minister Pramod Sawant.
His statement has come when the Goa minister had demanded him an apology for allegedly insulting Goa at the 43rd GST council meeting that was held on May 28.
