Ozzy was three weeks "early" (37-weeker) and started army-crawling 7 m, cross-crawling 8 m, and just turned 9 m and just started pulling up and cruising furniture. But he's not vocal at ALLL. I mean he's loud and hollers and screeches a lot, but not a lot of "babble." His sister (a month early, 36 weeker) was about a month behind the rest of babies her age... didn't roll until 6 months, didn't army crawl until 8, didn't cross-crawl until 9, didn't stand unassisted until I think 11-12 months, walked at 14 months. BUT she was a babbler from a very early age, all kinds of varied consonant sounds, a little chatterbox. I think babies tend to focus on one or the other most of the time. And I think that very late, and very early, babies show it in their gross physical milestones.
But, meh, by the time they are two years old it all shakes out anyway, lmao.