Thanks for the replies. I kinda figured that they were just moving through the stages at a different pace, but needed a little reassurance....A has only been with me a month, and S has been here two so maybe it is still some adjustment time too. I have just had 2+year olds for over a year now, and my son is 4 - I've forgotten what it is like to have babies around! I have been slowly encouraging him to try new things, like today I had him try to climb up one stair which led to a total meltdown and A laying on the floor sobbing. Same goes for trying to get him to hold a cup, not fun for either of us! I am thinking he is just going to take awhile to move up to where S is at. Honestly, I don't know how the bum scooting can be comfortable! He boogies like crazy and the sides of his feet and legs just look irritated all the time.