Baby Boden/White Company sizes

[Sugarandsalt]

Have a family event to take my DD to next month, she'll be 18 months. She's pretty small, about 9kg, average height (around 80cm). Generally get clothes in gap/Zara/vertbaudet as they seem to suit her narrow frame. I saw some nice outfits in baby Boden/White company and was wondering what size to order? To compare she's a perfect fit 12-18 in Zara/gap but the same size from next completely swamps her, while 9-12 months are generally too short.

My DD's average height and slim. She's 16mo and currently fitting 12-18mo verbaudet very nicely. Next does fit in the same size but is a bit on the larger side still.
I have a couple of pairs of white co PJs which fit well for length but I find are a bit loose around her waist. She has had other white co bits in previous sizes and they have fit well, matching her age. I have some Boden PJs which fit well, and some dungarees which are a bit on the long side. I haven't got loads from the two brands so can't say definitively, but hope that helps a bit!

Thanks piglet- I'm thinking in that case they probably will be loose. She has narrow shoulders and tiny hands and feet (size 3.5c/d at the moment!) and it definitely makes clothes shopping harder which is why I've been sticking mostly with the same few brands! I might just order some 12-18months and try them, and take a look at some of the European brands which seem to be cut smaller also.