New EU safety rules, just now being implemented, require that balloons may not be blown up by unsupervised children, for fear that the child may swallow the balloon and choke.  The same rules apply to party whistles and magnetic fishing games.
In addition the new EU rules dictate how noisy toys may be - including rattles and musical instruments.

The outcry over the new rules seems to center on how they will restrict a child’s freedom to play and to explore, restricting the types of play that encourage children to be independent.

Frank Furedi, professor of sociology at the University of Kent, warned: "These bans diminish the experience, both of having fun and learning, by turning play into a danger zone with rules that stifle life and adventure for children."

And, I wouuld add, increase the stress levels of the mothers who will be expected to abide by the new rules.