MUMBAI, May 3 -- The Mumbai-Pune Expressway, a high-speed corridor where pedestrians are barred, turned fatal on Friday evening as a five-month-old baby died and his mother was injured after she allegedly tried to cross the stretch amid heavy traffic near Adaigaon in New Panvel. Police said the woman, identified as Suvarna Shankar Kale, 24, a labourer from Adaigaon, was attempting to cross from one side of the carriageway to the other with her infant tied to her back when a car hit them. The vehicle, a Hyundai Creta, was being driven by Sanket Balwant Chavan, 29, a resident of Andheri East, who was travelling towards Mumbai with his employer after attending an event. "Walking on the expressway is strictly prohibited. Even two-wheelers are not allowed. Why she was walking on this stretch is not yet known," said senior police inspector Smita Dhakne. The driver immediately rushed the injured woman and the child to a nearby hospital, where the infant was declared dead. The woman remains admitted and is undergoing treatment. Police said a case has been registered against the woman for walking on the expressway under relevant sections of the Bharatiya Nyaya Sanhita and the Motor Vehicles Act. "The accident occurred due to the woman walking on the expressway," Dhakne added....