Add each family members size separately. 

Style: Fashion
Sleeve Length(cm): Full
Pattern Type: Cartoon
Department Name: Mother/Father/Kid
Fit: Fits true to size, take your normal size
Item Type: Sets
Material: Cotton
Family Look: Mommy and me Clothes
family matching clothes: mother and daughter clothes
Mother Son Clothes: Son kid clothes
Family christmas pajamas: Family pajamas
christmas pajamas family: Family Matching Christmas Pajamas