<10kgs in 18mths old

My parents brought me to Yishun Polyclinic for 18mos booster & check up on 06 Apr 2009.  As usual, i am a very strong boy (maybe because of my thick & hard skin) i didn't cry after the jab.  Only thing is my weight is slightly below the average as did not reach 10kg.  Mainly are because i did not eat much after 1 year old and very active like to walk & climb around.   I think i only have good appetite in once a week.  My parents hope that i can improve my eating amount.  Well, i will try to. =)