This crochet pattern is designed for girls 12-18 months, but easily customized for girls up to 7 years, depending on hook and yarn taken + special instructions for upper sizes. Originally the dress is designed in 2 colors, white and blue, but you are free to use miltiple color combinations to your choise.
For intermediate crochet skills.

You’ll need FINGERING yarn (aka super fine; sock; 4-ply) 18 - 20 wpi 185 - 230 per 50 gm (1.75 oz) ball 370 - 460 yards per 100 (3.5 oz) ball, such as
DMC Petra Crochet Cotton 5 /
Nako Solare /
YarnArt Begonia /
Scheepjes Sunkissed /
Seam Premium Silk /
Kamteks Mercerized Cotton (Мерсеризованный хлопок) /
Pehorka Пехорка Zhemchuzhnaya (Жемчужная) /
Semenovskaya Lydia or any that fits the yardage -

100 gm of color A
200 gm of color B

Hook 2.00 mm – 2.5 mm or any to obtain gauge.
4 stitch markers and a button (optional)

Gauge is 27 stitches per 4 inches

As usual, you get 2 versions of English pattern - with Brittish terms and US standard ones.
19 pages include:
1) sizes and measurements
2) gauge/tension, materials needed
3) tips
4) stitch guide
5) main instructions with photos
6) charts
7) line-by-line written instruction for each chart