9 month check up

James had his 9 month check up last week. (i got to make his 1 year check up sniff sniff). He weighs in at 20lbs 13 oz (50th percentile) and 28 1/2 inches long ( 70th percentile). what do the percentiles mean?? I have no idea. He didn't get any shots and i was so proud of myself for remembering his shot record. Dr gave him a clean bill of health. He didn't cry once. Usually he starts screaming when the dr starts to look at him. It was a good visit. Makes you feel good as a parent that you are doing everything right.