Few kits of Cardamine are left in my Etsy shop BluLichen. The pattern is given for the 14 sizes. The yarn is given for 2months to 12 months. 2years to 3 years; 5 years to 6 years.
Quelques kit de Cardamine sont encore disponibles dans ma boutique Etsy (BluLichen). Le patron est donné pour les 14 tailles, la laine pour 2 mois à 12 mois. 2 ans et 3 ans; 5 ans et 6 ans.

Addenda
p.4, under “yoke” remove the title “sizes 5 years and 7 years only” forgotten in the Pdf from a previous version.

After Muskari (Muscari motelayi) and Parisette (Paris quadrifolia) I was inspired by another protected plant to design a new sweater for child: Cardamine heptaphylla. Its english common name is pinnate coralroot. It is a small flowering plant common in mountains but protected in Dordogne, where I live. Generally their large leaf has seven folioles; their white or lilac flowers grow in many-flowered inflorescence.

Cardamine is worked top down, seamlessly. After the yoke has been completed, body and sleeves are divided.
Body is worked straight in stocking sts, button bands being knit at the same time. Sleeves are then worked in round, top down. Some flowers are finally embroidered on the yoke.
Level
★★
Sizes
Pattern includes 14 sizes corresponding roughly to 3 m, (6 m, 9 m, 12 m), (18 m, 2, 3), (4, 5, 6), (7, 8, 9) 10 years, for a body bust circumference: 16½, (17, 17¾, 18½), (19¼, 20, 21½), (23, 24½, 25¼), (26, 26¾, 27½), 28¼ in; 41, (43, 45, 47), (49, 51, 55), (59, 62, 64), (66, 68, 70), 72 cm. Pattern is designed with 2-3 in / 5-7 cm positive ease.
Final measurements are given in schematic (see picture).
Material
Yarn
Katia, Arles Merino (100% wool, SW, 1oz¾ / 50 g, 109 yds / 100 m), colour 64 mint green, or 52 pastel orange: 3, (3, 3, 3), (3, 4, 4), (5, 5, 6), (6, 7, 7), 8 skeins.
Few yards of white DK yarn for the embroidery.
Needle
US 6 / 4 mm circular needle (main needle for body) or size needed to obtain gauge.
US 4 / 3.5 mm circular needle (for edging) or 2 sizes smaller than the main needle.
Five double-pointed needles in the same two sizes for the sleeves.
Notion
Scrap yarn.
4 stitch markers.
Tapestry needle.
4 or 5 buttons according to your size.

Gauge
20 sts x 32 rows worked in stocking sts over 4in / 10 cm using US 6 / 4 mm needle, washed and blocked.

A huge thank you to the friend knitters who have tested and corrected the pattern. As usual I have learn a lot from them. Any error left in the pattern would be my own responsibility.
Thank you Carlyloveknit, yarnoverkd, lilba, isthislove, carmen7104, labedz, Françoise, hatnmade, heturk, DianaBog, isadebem, anaminetta.