I had dd and ds2 in a shopping trolley today, sat next to each other. Ds asked to get out and walk but it didn't register that there were no straps on the trolley so dd toppled over and banged her head. I feel awful! Is there anything anyone uses to keep them in or do you just use reins? Shes too big for the baby bit and spends the whole time craning her neck. Awkward stage really