Russ And Chris

So this is our newest problem. It seems he can pull himself up to standing.. Surprised the heck out of me when he first did it. Thankfully just a few days before we had lowered the mattress to the middle setting.. From the way he's standing I'm thinking we need to put it all the way to the bottom now.
With this new development is the problem that everytime I put him to bed he moves into a sitting position. He then cries cause he can't get back down.. So I go in lay him down and the process continues.. For two days this week he wouldn't go down for naps, would just cry for an hour or two.. Thankfully Russ has been home the last two days and he has been able to put him down (only after I wore him out). It's just a phase, right?