Yowie DS was 6lb 13oz, he was full term. I'm a tiny thing and DH is tall and skinny. DS has always hovered around the 10th percentile for height and weight and I too got quite concerned but the MCHN told me it's nothing to worry about as long as the height and weight match up. It would only be an issue if he was in the 10th percentile for weight and say the 90th for height. That being said my MIL told me DH was always way off the charts for height (very tall) and near the bottom for weight, he's always been slightly built. So who knows!

Perhaps as your DD was born quite big her weight plateaued out a bit earlier than some. Are you and your hubby small people? I find it odd that your MCHN was so concerned...6kg at 6 months is still like the 3rd percentile, I thought they'd only get worried if they drop off the chart completely. What's she like lengthwise? It sounds like she is perfectly healthy and doing just great Standing up and cruising around furniture at 6 months is awesome!!