My youngest DD stopped riding in the stroller not long after she turned 2, because she figured out how to undo the buckle and climb out of it! Now we just put her in a trolley, or let her walk - but that makes shopping especially very difficult as she is a runner. We have tried using a harness on occasion too, which works ok, but she does get annoyed with it very easily when she can't go where she wants to! ATM I try to avoid going to the shops with her altogether, until she is a bit older.