I was about 9 lbs. I'm currently 5'4" and weighing 9 stone 13lbs. I'm normal BMI.
My husband was about 8lbs. He's currently 5'10" and weighing 22 stone 6lbs. He's morbidly obese.
My daughter was 10lbs 10oz and right now at the age of 8 years 10 months she's 4 '4" and weighing 6 stone. She's overweight by about 6lbs. She's on a diet! Unfortunately she's very sedentary.
My eldest son was 10lbs 1oz and right now at the age of almost 7 years (he'll be 7 in a fortnight) he's 4'1" and weighing 4 stone 3lbs. He's near the top end of normal weight. He eats a lot but he's very active.
My next son was just over 11lbs and right now at the age of 4 years 10 months he's 3'7" and weighing 2 stone 13lbs. He's near the bottom end of normal weight. He eats like a sparrow.
My next son was 10lbs 8oz but I don't know what he currently weighs. He's 12 months old. I think he's normal though, he has been following the 75th percentile curve on the chart for a while now which is totally normal.
I really really don't think there's much of a correlation at all, as DiddyDec says, between birth weight and weight in later years.