Easy to read, lots of pictures, suitable for all skill levels. Standard US terms.

Pattern includes instructions for sizes:
Newborn
0-3 Months
3-6 Months
6-12 Months
12-24 Months
3-5 Years
6-10 years
Adult- Small
Adult- Medium
Adult- Large

You will need:
3 skeins of medium weight worsted yarn (soft blue, aqua blue, white)
5mm hook
1.6mm hook (small hook, to make snowflake for baby sizes)
Measuring tape
Yarn needle
White sewing thread