Speaking of crawling, take look at this!
I'm one proud mama. He's been crawling in his BnBs 'full time' for a week or so now. Amazing for a little chap with low muscle tone, and a very weak left arm (not to mention his feet being fixed together). He first started commando crawling forwards 2 days before getting his Boots on, at about 10 months old. Within a week or so he was doing a few 'proper crawls', then 'collapsing' on his left arm, commando crawling just using the right for a bit, then pushing up for a few more proper crawls. Then sometime in the last week I noticed he was proper crawling all the time. My goodness! He is doing so, so well. We have done physio exercises many times a day, every day since he was a few weeks old, and he's come so far. When he was born his left arm was totally floppy, no movement whatsoever. It's still a fair bit weaker than the right (which isn't 100% itself) and is also shorter than his left... but somehow it manages to share the job of supporting his weight, and... he can crawl!