Mason (11 months old) started crawling a few weeks ago and is now cruising (rather quickly) all over the house.  He managed to pull himself up on the pack-n-play once this past week and now there is no stopping him. 

He pulls up on anything he can find including the stroller, a rocking chair, the highchair, any and all tables and shelves - especially the ones with sharp edges, and even the diaper pail.  Most of which, topple over on him which then leads to a outburst of crying.  

The crib is no longer a place to sleep but a jail cell that he needs to find his way out of.  He no longer will just lay down in his crib when we put him down to sleep, since he learned to pull up.  Now he is jumping and yelling and using every bit of strength to try to heave himself out of his crib.  

Bedtime now involves listening to Mason yell on the monitor for about 30-45 minutes before he passes out.