Authorities have found no signs of foul play in the investigation of a 7-month-old baby who died Saturday, authorities said Tuesday morning.Police questioned the mother and grandmother of a baby who died Saturday night in a house in the 900 block of N. 35th St.Police and emergency medical crews found the child unresponsive when they answered a call for assistance about 11 p.m., police said Sunday. The mother, grandmother and several other children were in the home at the time, police said.