In my theme's archive template, I'm using


to get a specific thumbnail size for each post. But that doen's work on all posts. Some posts display their featured image in full size, while others display the correct "list-thumb-small" size.

I have set the custom image size in functions.php:

add_image_size( 'list-thumb-small', 225, 185, true );

Why is this happening and how can I fix it?

1 Answer 1


Those might be old images. Image uploaded to WordPress before adding this new image size code will not resize automatically. You will have to resize old images again.

There is a great plugin for that. Use Regenerate Thumbnails plugin to auto generate thumbs for all images. If you ever add a new image size then always resize images again with this plugin.

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