We don't have a scale. When I want to know my kids weight I borrow a scale from my neighbour (its digital). About a month ago I weighed my 2 year old and she was 25lb. Yesterday I took her to the doc and she was 27lb. I suppose she COULD have put on 2lb in a month but it doesn't seem likely. Our seat only rear faces to 30lb. I thought I had lots of time when she was 25lb but 27lb seems so much closer to the limit. I really don't want to buy a scale but even if I did, how do I know its accurate?