Petit Bateau baby and toddler clothes sizes?

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I always like the look of Petit Bateau baby clothes although they tend to be way too pricey for me. I was thinking of buying a few things in their sale but I’m confused by their sizes as the height limits seem less than other brands like H&M. Any experience with them? Should I size up? My DD is very slim but long.
Also are they worth the £££?

I have some pieces that were gifted to me. They are very good quality but they do come up small. My daughter is 76cm and their 81cm size is just perfect on her now.

I find them very slim fitting too.

Size up. There sizes are up to, not for that age. Ie age 3 is ‘up to age 3’ so usually fits 2 year olds.
My 3 year old is wearing 104cm/ 4 year pjs, he’s had them a year already ie from 2. He’s almost 100cm, and they will prob last a few more months.
I really like them if tall but slim as they then fit well in leg without falling down at waist.

I have just bought him age 6 (116cm) in sale for next pjs. Figured if slightly long at first fine for pjs and save’s buying every size. They have small waist also