Shaking and hitting herself

Alexis • Married. 02/07/17. 23. Baby Girl 08/22/18💕. hypothyroidism. PCOS.

So my Daughter is almost 9 months old, and recently I have noticed when she gets excited or really frustrated she will tense her whole body up and get a little shake going... but now she’ll also smack her hands to the side of her head and hit her self even if she has a toy in her hand... wondering if it’s normal or if there is anything I can to to try and get her to stop more so the hitting then the shaking...