Here you see the model version. Look at those buttons. Note Green sweater has no buttons, but alas, a zipper. Also, that's my Mona Lisa smile, aren't you wondering, "what is she thinking?" A good guess would include, "take the picture, take the picture." Or "the baby is nakee, and holding a dirty diaper, nice." You choose.
But if you would like to see other fine examples of easy to work up top down patterns, check out Knitting Pure and Simple.
In my lovely daydreams of being a famous knitwear designer, I dream in top down designs. I have kind of decided that kid sweaters in the round are going to be my known for thing.
Why kid sweaters? Because they are small, they'll be done soon, and if they don't fit they knitter can say "wow that design was so good and nice, it's too bad that darn kid grew faster than I could knit." It's really the Perfect Plan.