The Little Linen Company beautiful plush character Baby Comforter Toy / Security Blanket Ballerina Bunny. No matter if you call them a security blanket, comforter toy, lovie, lovey, blankie, doudou or even nunu, your little one is sure to love them.
Early studies show comfort attachment starts before 12 months of age  and these tactile items can be visually soothing as well. 
The top tip is to get multiple to rotate them for when washing, they get worn out or go missing. For references, please see below.
Composition: Smooth, soft short pile plush polyester blankie body and head
Blanket body size: 25 x 25 cm (edge to edge)
Outer: 100% Polyester, Fill: 100% Polyester (all-new material).
Wash separately before use. Warm hand or gentle machine wash with like colours, max 40°C / 105°F. Line dry in shade or gentle/low tumble dry. Do not iron. Do not rub, soak or wring. Do not bleach. Do not dry clean. DESIGNED IN AUSTRALIA. MADE IN CHINA.