We had our 4-month (give or take 3 weeks) appointment today, and here are the current stats:
Length: 25 3/4" = 63rd percentile
Weight: 12lbs. 3.9ozs. = 2nd percentile
Head circ: 16.5" = 26th percentile
The verdict? He's still a peanut! The doctor does not have any concerns about his size, though, as long as he is still growing, which is all that matters.