DD2 has always been tiny - hovering between the 2nd and 10th percentile for most of her life. She had a check up today and is on the 10th percentile. She barely eats but is constantly on the go. DD2 has been seeing a paed over the last 15 odd months and he has no concerns about her weight, despite knowing of her incredibly poor diet, weight etc.
So long as your little man is active, alert etc I really wouldn't stress about it, especially if its a genetic thing in your family.
My DD1 was similar at that age - around the 10th for weight, 50th for height and 90th for head!! Just like her father - tall, skinny with a big head Anyway at 6yo she is still tall on 75th now, still has a big head 90th and still skinny for her height but is now at the 40th.
If your DS is happy and healthy and you have a certain build that runs in your family then I don't think there is anything to worry about.
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