On Thursday, we took Vinny for his six-month checkup. He weighed 19 lbs and was 27.5" in height. The doctor gave us permission to go ahead and give him some green veggies. She asked if he was sitting up on his own, and we told her that he wasn't yet. She urged us to prop him up and kind of tripod him with his hands on an interesting toy.
Well, on Sunday he just decided to start sitting up, hands-free. The day before, he couldn't even sit up on his own. Then on Sunday, he could sit up and stay seated without the help of his hands!
If he leans over too far, he will fall, but really you can leave him seated on the floor and he will stay like that for quite a while. I am just amazed by how fast this development came!