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To display validation messages in child components in Blazor, you can use the EditContext class and the ValidationMessage component.

1. In the parent component, create an instance of EditContext and pass it to the child component as a parameter.

<ChildComponent EditContext="@editContext" />

1. In the child component, define the validation rules for the input fields using attributes such as [Required], [Range], etc.

<InputText @bind-Value="@MyValue" />
<ValidationMessage For="@(() => MyValue)" />

1. Finally, add the ValidationMessage component below the input field to display any validation messages for that field.

You can also customize the appearance of the validation messages by styling the validation-message class or creating a custom validation message component.