Niko has been both of these things for a while, but with my old, slow digital camera - I haven't been able to get good photos of him doing it. I borrowed a friend of mine's nice DSLR camera last night and what a difference!
Niko has been doing push-ups for a long time, but he is getting the idea of moving his legs while he does the push-up. Yikes. Don't figure out crawling yet - we have to move first!
Niko can sit for about a minute or so. He can lift his hands up over his head while he is sitting. He did it last night and let out a screech then toppled over. He got too excited about sitting up I guess!