I think her weight is fine. DD was 2.9kg when she was born and although she has always been on the petite side she gained weight consistently from birth and we have never had any concerns. She is happy, healthy and bright but always been between the 3rd and 15th percentiles for weight.

As for then length - DD had arms measuring 1 week ahead of the rest of her measurements - yes she does have longer arms (just like her monkey-armed daddy) but you can't tell as she looks in proportion.