The pattern is written is UK terms and for a 15inch chest - so a newborn to 3mth baby.

I used approx 237.5mtrs of chunky yarn and 250mtrs of dk to make this garment.
I have found lately, going by the length of yarn rather than the weight is a better gauge for me as some balls/skeins are so much shorter than others for the same weight.

Also as a rule of thumb if you wanted to make for bigger sizes, I did find that appox 5chs per inch and 2 rows of trebles per inch - but that is my crochet and tension - yours could be different.