It seems that we are breeding a drummer. For the last couple of days Maxim is drumming with his legs on everything he can touch. We put him in his cradle, he find the edges and drums. We hold him vertically, he finds the surface and drums. He does it rather strengthfully and for extended periods of time. For example, when I took him for a walk today, he was drumming with his legs for almost three and a half hours! Minus the thirty minutes that he slept.
I guess he is not hurting himself much, because he seems rather happy while doing it. He even smiles occasionally. Maybe he is training his leg muscles for walking times that will hopefully arive soon.