My five month old has said mmgee (as in hungry), hey, Mama, Dada, and "Hey, Dada" all as words, not just random sounds. Sometimes he does go dadada just randomly to try out sounds, but he will say words. The first time he said Mama for real, he was crying and I walked into the room, and he looked up at me and said, "Mama!" so we definitely counted that. His first word was hey. He'll sometimes say hey, and if we don't answer back, he'll keep saying it until we say hey back. It's cute.