Alamak, memang ada few moms dalam circle saya yang notice behavioral changes lepas vaccination, some kids jadi quiet atau sleepy for a day or two je. But kalau dia tak demam dan nampak okay physically, usually it's just temporary reaction to the jab, especially kalau tired atau overwhelmed dengan semua the stimulation. That said, since this is something yang bothering you and dia dah berubah significantly, better check dengan pediatrician just to make sure everything's fine, dia boleh assess properly dan kasih peace of mind, okay?