My son Bhabik is 4.9 years old, he is in class UKG now, from the last 1month, whenever he reaches school, he starts crying and we also have to enter his class, but as soon as the class starts, he forgets everything and studies with great pleasure, why so? Then every day he comes home by sharing his tiffin, pencil or rubber with someone at class, but at home he behaves completely normal,, any suggestions..