DD2 is 22 mths 13kg and 89cm, a bit older then you asked for but thought i add to the list lol
when DS3 was 18mths he was just under 10kgs
DS is 17months, 13.1kgs and in size 2. Charlie didn't hit 10kgs till she was 2 and still fits a 2 around the waist! We had to order her uniform specially for her cause she so little! Both of them are tall though, Xavier is just a brick and Charlie is a skinny minnie!
DD is 8kg at 20 months, but she's been the same for the last 6 months or so. She's about 86cm last time she was measured. She has been to the paed and been cleared, she is just meant to be tall and skinny.
18 month old DS is 12 kgs
I LOVE BEING A MUMMY!