It's so interesting that both of our boys (ages 3 and 8 months) seem to have hit milestones at exactly the same time. Rolling (exactly one day before 4m!?), sitting (6.5 months) and crawling (a few days before 8m....well, I may be jumping the gun here by R is rocking like crazy and I'm guessing it's "any day now")

Were your kids similar?