As a parent of both genders (as well as a friend to many moms with both), the consensus seems to be that girls hit their milestones faster than boys, even gross motor. I always thought that girls hit speech milestones faster and boys hit gross motor faster. But it doesn't seem to be the case within my circle of friends. My DD definitely hit her milestones (all of them) faster than my son. Crawling, pulling up, waving, smiling, talking, self-feeding.... She's been at least a few months faster than my son.