Milestones...Pfffft!

most

Child's Age	Mastered Skills (most kids can do)	Emerging Skills (half of kids can do)	Advanced Skills (a few kids can do)
13 months	Uses two words skillfully (e.g., "hi" and "bye") Bends over and picks up an object	Enjoys gazing at his reflection Holds out arm or leg to help you dress him	Combines words and gestures to make needs known Rolls a ball back and forth
14 months	Toddles	Toddles well Initiates games Points to one body part when askedResponds to instructions (e.g., "give me a kiss")	Uses a spoon or fork Matches lids with appropriate containers Pushes and pulls toys while walking
15 months	Plays with ball Uses three words regularly Walks backward	Scribbles with a crayon Runs Adopts "no" as his favorite word	"Helps" around the house Puts his fingers to his mouth and says "shhh"
16 months	Turns the pages of a book Has temper tantrums when frustrated Becomes attached to a soft toy or other object	Discovers the joy of climbing Stacks three blocks Uses spoon or fork Learns the correct way to use common objects (e.g., the telephone)	Takes off one piece of clothing by himselfGets finicky about food Switches from two naps to one
17 months	Uses six wordsregularly Enjoys pretend games Likes riding toys	Feeds doll Speaks more clearly Throws a ball underhand	Dances to music Sorts toys by color, shape, or size Kicks ball forward
18 months	Will "read" board books on his own Scribbles well	Strings two words together in phrases Brushes teeth with help Stacks four blocks	Throws a ball overhand Takes toys apart and puts them back together Shows signs of toilet training readiness

III found this chart on Baby Center. I always find these milestones charts amusing. I highlighted all of the things on here that Jackson does. I think a lot of new parents worry when their child isn't doing something they "should" be doing. The fact is, all kids are different. Not only do they learn to do things at different ages, but they learn differently. You can't compare at all. 
Jackson does some things, that apparently he should learn in 6 months, but doesn't do other things that  he should already be doing. He has said a few words, "Mama" ,"Dada" ,"Duck" ,"No", "Bye bye", "Uh Oh" and "Up". Right now he is in a phase where he isn't really using any words. He is too busy learning other things. He has learned to climb down stairs, climb up on things like the couch, stack toys, (tries to) brush his teeth, and tries to use the door handle. He also LOVES to copy. Mostly sounds and gestures, words not so much. Today he discovered that he can feed me. Which makes feeding him even harder, not only is he picky, but anything i do give him he just wants to feed mommy. Oi.
I think charts like this are great as a guideline only, you know your child best, and a mothers intuition  will tell her if something isn't right.