Gross motor skills are larger movements your baby makes with his arms, legs, or feet, or his entire body. So, crawling, running and jumping are gross motor skills. Fine motor skills are smaller actions. When your baby picks up things between his finger and thumb or wriggles his toes in the sand, he's using his fine motor skills. But it's not just about fingers and toes. When your baby uses his lips and tongue to taste and feel objects, he's using fine motor skills too