Why does your 3 mo old baby clench fists?

A 3-month-old baby may clench their fists as a natural reflex known as the grasp reflex, which is part of their developing motor skills. This clenching can also indicate excitement or discomfort, as babies often express their emotions through body movements. Additionally, fist clenching helps them explore their own body and the world around them as they start to gain more control over their movements. Overall, it's a normal part of their growth and development.