I am Five (months)

I was actually five months a couple days ago, but Mommy's just now getting around to writing this! Silly Mommy.
Today Mommy and Daddy did yard work, and I helped by sitting and playing. I helped trim the grass. Sitting up by myself and playing is something I can do now! Here are some other things I do now:

• rolling over from back to tummy a lot,
• sucking my thumb,
  
• playing with everything and exploring things with my mouth,
• coughing on purpose (Mommy and Daddy were a little worried until they figured out I was faking!),
• shrieking like a steam whistle when I get really mad,
• anticipating familiar things like my sling and jumpy seat,
  
• lunging for things (like the doorjamb -- ouch!) in my jumpy seat.

I can't crawl yet, but I really, really, really, really want to!!!! I try very hard but I haven't quite got it. Mommy and Daddy had better watch out when I do. Because there is a world full of wonderful STUFF out there!