I am afraid of troubles, therefore I only bring my son out for at most 3 hours, unless I go to somebody's home. Only once in Chinese New Year, I brought him out from morning to evening, extremely tiring, and he could not sleep.
The things to prepare:
1. diapers and wet tissues
2. milk powder, bottles and hot and cold water
3. napkin
4. clothes, in case he vomit
5. pacifier