Oo normal lang yan, sis! At 3 months, ganyan talaga, parang nag-eexercise lang sila ng arms at discovering kung ano kaya gawin ng katawan nila, kaya laging nasa air ang kamay haha. A few of us mums noticed rin yan sa babies namin around that age, parang excited lang sila or sometimes it's part ng startle reflex pa. But since we're talking baby movements, mas peace of mind if you mention it sa pedia mo next visit, just to be sure everything's on track and walang red flags. In the meantime, relax lang, most likely yan ay totally normal developmental stuff!