Children make noise. Clearly! They rage, they play, they are just loud sometimes. Some more, some less. A private garden is of course an Eldorado for children. There you can really let off steam and nobody says anything against him Children's noise in the garden, Or is it?
There are many neighbors who want to prevent children from making noise. These are exactly the same people who think they can stop a baby from crying. Neither is possible in Germany! That means: If babies cry and children are loud, then they can do that.
Children's noise at rest
Even in quiet times there is nothing you can do about child noise from the neighboring garden. Unless it is a whole pack of children. Your own children plus three friends are allowed. If there are more, you can admonish to rest, then nobody has to accept that.
Keep children to rest
Everything else has to be endured for better or worse. Nevertheless, due to the good neighborhood, parents should also encourage children to rest at least during the rest periods. A conversation often helps more than admonitions or arguments.