Copy Cat

So Aydri has been copying a few things for a while now like kissing noises and sticking her tongue out and blowing, but recently she been doing a few more. I didn't realize that I nodded my head at her so much until she started nodding back. She does it constantly. She has also been saying, "mama, mama," when she cries. I remember Kendi doing this at 6 months. At first we thought Kendi was just making a new sound and that she didn't really know what she was saying, but we realized that she did it consistently when she was hungry and started saying other words too. She was an early talker. Aydri has started doing the same things. Can babies really say their first words at 5 months?