DS (18 months) has returned from nursery this evening with a cake he's 'made'. Was slightly concerned to see that it's decorated with a full size marshmallow on top. His nursery are usually brilliant with safety etc, but aren't these a major choking hazard? Can't tell if I'm being a bit PFB about this or if it's worth saying something to nursery. DH thinks we'll be 'those parents' if we do...