You have a beautiful setup! No way would I put that TV and your AV equip in an entertainment center! Won't look as modern and won't let the equip breathe as easilly.
Agreed you want to keep your 8month old daughter safe from falling speakers and such. But I do agree with commsysman about bolting the stuff down and anchoring them to make them sturdy and tip proof.
Also I have a 9.5month old daughter and she is crawling around every where and starting to pull herself up so I know what your going thru. And I'm not trying to tell you how to raise her but I am making the front of my living/ht room off limits to her. When she crawls up there I say "NO" and carry her back to her toys. Nothing bad, nothing mean just trying to teach her that its off limits. I have an open tv stand and the tv hangs/mounts to that stand and I have all my equip and center speaker on that stand. I also have 2 tower speakers for my Front L&R speakers and 1 of my 2 subs up near the Front R speaker. So far no issues whatsoever.