Carrying baby food is a must! You never know if you will healthy food everywhere. So it's better to pack some.
Packing a first-aid kid with all the emergency medicine should be your top priority.
Also, carry a bag with lotion, diapers, tissues, and similar things used by your baby every day.
A water bottle is a MUST!!!
If you do not want your kid to cry or get irritated on the journey, carry some small toys too.