At what age (milestones)

I know all babies are different but at what age did your babies
Roll over?
Sit up alone?
And start Crawling?
My lo is 4 months can roll over and almost crawl!! And trying to sit up alone

My daughter started rolling over 6 days before she turned 3 months. She is 5 months now...trys to crawl but cant quit do it...she gets mad when she fails to do so. She sits up pretty good but not for a long period of time

could roll both ways at 3 months, sat unsupported and army crawled around 4 months

Roll over (back to tummy)? 11 Days Old
Roll Over (tummy to back)? 15 Weeks Old
Sit up alone? Around 5 months.
And start Crawling? DD started army man crawling at around 15/16 weeks old and was on all fours crawling at 6 months.

DD rolled over at 4 months. Was crawling by 5 and sitting by 6. She just started walking at 9.

mine rolled at both ways at 2 months & sat up around 3.5mo right before he started crawling on fours at 4 months...

lo sat unassisted right at 4 months diddnt roll until 6.5 months army crawled at like 7.5 months real crawled at like 8.5 months now at 9.5 months he is trying to walk. he took 2 steps on his own yesterday!  

Roll over(complete 360)- One time at 2 months.. now she doesn't do it much.
Sit up-She's still not doing that. She tries though!
Crawl- 4m she gets her knees underneath her and scoots herself forward.