Oh, yes! Just today, placing baby in sitting position without any support, he could balance himself while whacking at his baby toys! I tried it yesterday and he toppled over onto my hands, so this time round I prop him up and he could sit without any support! Of course I still place my hands nearby just in case, he still looks a little shaky, but by and large he is sitting pretty much on his own!
Crawling still not there yet, though he just might judging from baby pushing his butt upwards. However he likes to sit on the baby walker and move around. So those motionless baby rocker as well as that chair sitting trainer my wife bought is no longer wanted. In fact baby make a tantrum if you place him on those as he couldn't get himself mobile!