shoe help please!

My 'big' bridesmides will be my 8 yr old step daughter, my older neice and big sister. i am wonderening if any one knows of a place i can buy adult shoes and a very similar pair of child shoes (well a size 2) with a very small heel. the other 2 wants proper heels on theirs! they will be wearing 3 /4 dresses so need them to match as much as poss. thank you in advance and sorry for the grammer i am posting on my phone ooo the colour will be silver xx