Dd is 6mo and started patting her head a few weeks ago. Each time she does it I sing 'head shoulders knees and toes' Today she was sat on my lap and I sang it, as soon as I started she patted her head!
I did it another 7 times and she did the same.
I dont think shes advanced at all but just wondered what age everyones elses los did something similar and what they/you did.