" Does anyone else think those massive boots look ridiculous – surely too big for her to walk in! Would they have put her into great big boots to help her stand up, and be still for the photo?"
It may not apply in this case, but when I was a kid, shoes were always bought bigger than
the size you needed. As kids can grow very quickly the saying was " he'll soon grow into them"
Same with clothes. Many clothes were also hand me downs.