This pattern is written in UK terms
Baby cardigan and hat made in the waffle stitch
with options for a V-neck or round neck with a beanie or a pompom hat with earflaps.

0-3 round neck uses around 130g for cardigan and 35g for pompom hat
0-3 V-neck uses around 120g for cardigan and around 25g for the beanie
3-6 round neck uses around 160g for cardigan and 45g for the pompom hat
3-6 V-neck uses around 150g for cardigan and 35g for the beanie

6-12 round neck uses around 210g for cardigan and 55g for the pompom hat
6-12 V-neck uses around 200g for cardigan and 45g for beanie