5 months

He started lifting his butt in the air a day after he turned 5 months old.

I was so excited when I witnessed him do that. He was in his crib, trying to move.

He tries to push himself forward, but only manages to scoot backwards.

We're also working on sitting unassisted, but he moves too much, so he ends up tipping over after a few seconds.

And finally, after a week, he's pulling himself up on all four.  One step closer to crawling.  

Lastly, he's teething like mad and have been tossing, turning and crying a night.

His night feedings have become less.

I keep checking his tooth daily to see if there's any sign of progress and YES! I see what looks like a bit of tooth showing through.