just be yourself la.. if that day you or baby so tired.. then use bb trolley lor.. if the day is not tired and very nice weather.. let him try to walk lor... don't need to care the other mami use trolley or not.. just use the way you most comfortable lor! hai... honestly.. once baby sleep .. you whole him all the way.. is not easy gak! understand!
You can try to go to the school with the trolley before the school day, but try to ask your friends or your relative to go there with your bb and you in the rush hour. Then, you will have the answer.