Sitting up stright

Garrett has been sitting up straight for about a week now. He has been sitting propped up for quite a while but would fall backwards when he tried to sit up straight. Now he can do it great. He crawls around, sits up, plays a minute, then begins the process all over again. He loves being able to move and groove like Emma. We love him and are glad he can move too . . . most of the time. ;) Now he tries to climb the steps. He can pull himself up on the bottom step then gets mad because he can't do anything else.