Oo, normal lang yan sa babies, lalo na pag excited or happy sila! Pero kung nakikita mo na parang excessive na or may kasamang iba pang concerns like difficulty breathing, fever, or parang may problema sa swallowing, better check with your pedia just to be safe. One of my mum friends was worried din dito, and the doctor assured her it's just their way of expressing emotions, pero it's always good to have a professional look, especially if it's bugging you pa rin.