They uploaded a photo because it's Children's Day.

It’s really thoughtful of you to upload a photo that shows half of your childhood look and half of your current look like this.
Besides this photo, she also posted one with shorts, and it looked like she was wearing a lot of fat.

I think the photo is really cute too, with him wearing a hat just like he did when he was little.

Now that I have the photo split in half like this, it looks like not much has changed since I was little, and it seems like I grew up exactly the same.

Also, perhaps because it is their first Children's Day since debut, it is nice that they are uploading a lot of content like this.

I'm looking forward to seeing what you'll post for Children's Day next year.