bottle feed

I have been bottle feeding my LO since born. (Formula cos i cant produce milk). She is now 3.5months old. Lately, whenever i bottle feed her, she will just keep moving her hands here and there, turning her and there. She is definitely hungry but many movement during feeding. I tried holding her hands to lock her down but she will get frustrated. Is it normal for babies to move around during feeding? As this happen lately only.