Warning to Parents: These are NOT sweets!

While bending down to pick up some baby wipes in the BABY aisle of Tesco, my 4 year old managed to put one of these in his mouth! I only had my eye off him for a few seconds, and naively assumed that the BABY aisle of Tesco was safe. Not so. These were at child height level. The lid falls off very easily and the tablets look EXACTLY like sweets. Much frothing of the month, but fortunately no lasting damage. Why can't Tesco provide child proof locks on something that they put prominent warning to keep out of the reach of children?