Hey Breesa,

We have an Ergo, got it when DD was 1 and LOVE LOVE LOVE it, While DS was little we have used a HUg-a-bub carrier, we used a Baby Bjorn last time but found DD outgrew is really quickly.
DS is also about 7kg but I find the Ergo is still a little wide for him, he has to do the splits, he seems to like it though. I would highly highly recommend it. You can wear them front and back and it super comfy but it might be couple of months before its perfect. WE used it for DD when we were travelling. 2 and 1/2, 15+kg and it was great. Customs is SO not toddler proof. She didn't have to walk as far when she was tired and I am sure it saved us a couple of tired tantys. So you will get LOADS of use out of it.
ANd just to add...I don't work for Ergo