Why does baby kick his legs simultaneously?

Babies kick their legs simultaneously as part of their natural reflexes and motor development. This movement helps strengthen their muscles and improve coordination as they explore their bodies and environment. Additionally, simultaneous kicking can be a way for babies to express excitement or discomfort, as well as a response to stimuli such as sounds or visual cues. It's a normal part of their growth and helps prepare them for future movements like crawling and walking.