My friend just told me that her 7 month old said 'mama'. My baby is almost a year old and hasn't even tried to say it. :( At what age do babies usually start speaking?

From 7 months babies they start mumbling that is like “gaga”, “ahah”,mama” , “papa” …just tat we know the meaning of papa and mama they don’t understand it..Their real understanding and uttering words starts later ….