My dear.. don’t worry. Haha. And don’t read too much too. As long as baby is moving both hands and legs well, it’s fine:) if there’s cerebral palsy, there would be a lot more signs than this. Bring baby for all the polyclinic/PD visits, where they will do the developmental assessments as baby grows.
Sounds normal to me(: Do check with your pediatrician on your next visit take care y'all!