BONUS:
Video tutorial on the example of size 6-9 months. If you have any questions or doubts, please watch the video. Good crocheting.

Overall pattern includes 8 sizes:

Newborn, 0-3, 3-6, 6-9, 9-12 months,
1-1,5 years; 2 years; 3-4 years

Gauge:

20 dc
x
12
rows dc =
10 x 10 cm (4 x 4 inch)

Materials:
Hook 3,5 mm & 3 mm. Yarn: 175m/50gr, 5 ply sport cotton/merino yarn (e.c. Drops «Safran», Drops “Baby Merino, Gazzal “Baby cotton”, Alize “Cotton gold”). 90/115/120/125/135/150/170/190 gr