I hate getting bogged down by milestones, but I'm just starting to get a little anxious about DS, who is 8 months. He's not yet rolling over or bearing weight on his legs.
He has rolled front-to-back a few times accidentally, but never deliberately, and never the other way - he rolls up onto his side sometimes but then flops back down. He will kick his legs, and can bounce in his bouncer, but if you hold him & try to get him to support his own weight he collapses after about a second! He hates being on his tummy so I can't see him crawling any time soon.
Otherwise he seems fine. He's sitting unassisted pretty reliably now, and a smiley, sociable, busy little boy. He uses his hands well, plays with toys & babbles all the time. Do you think there is any cause for concern?