kpptn74

I have and 7 and an 8 yr old. Both are tall for their age. My 7 yr old is a few inches shorter than my 8 yr old. My 8 yr old weighs about 60 lbs and my 7 yr old weighs 45 lbs. They are both pretty skinny! (Thank GOD for elastic waists!). What size should I get for them? I am not quite sure how tall they are but I know they are both atleast 4"... I don't see any kind of growth spurt coming anytime soon, so I don't think I want to get them too big (they are going to need to be able to wear them now). HELP!