Overly excited baby at 5 1/2 months

Hi mummies, my baby is 5 1/2 months. He seldom cry, eating and pooping are normal, he is social, smiles and babbles with people. However, he seems restless / excited all the time. He would kick his legs really hard and whack things all the time, is this normal? Appreciate any advice thank you! #1stimemom #firstbaby