packing a diaper bag...

• 4-5 diapers (newborns poop A LOT!)
• diaper cream
• changing pad
  
• a complete change of clothes for baby including a onsie
• burp cloth
• pacifier
• 2 nursing breast pads
• 1 maxi pad
  

As the baby gets older you can add:

• rattles/toys
• container with cherrios or small food
  

I also like to have an extra set of clothes, pacifier and some diapers in the trunk of the car...just in case you forget your diaper bag...which WILL happen when your not used to remembering, or in case you run out of diapers in your diaper bag. This happens to me all the time...even with my 5th baby...