The decision to switch from tape style diapers to pants style diapers is a choice that requires a comprehensive analysis.
It is not necessary to use pants style diapers when your baby starts to roll around. Other factors should be taken into consideration: the shape and size of your child, potential budget concerns.
If you currently find tape style diapers convenient, its not necessary to force a transition to pants style diapers. However, if your baby is very active and passes a more solid stool, you may find pants style diapers easier to use.