I have a number of baby knit patterns, some of them very old and in d/c ed yarns. How do I figure out which size is for what size baby. Like a cap for a newborn - what circumference if knitted in baby, in sport and in worsted? The same for a 3-month, a 6-month, etc. Are there sizing charts available somewhere? And for booties, what is the length of the finished soles for the various sizes? I have a booklet (currently in the stores) called "winter warmers." It has a pink snowflake hat and booties but is made from Red Heart Super Saver which is a worsted. I wanted to make it from a DK or sport or even baby weight. How do I do the conversions for the 2 sizes, newborn and 6 mos?