From the pattern notes:

"This is the much anticipated LTK longies pattern. In one fell swoop, thes adorable pants replace diaper covers, pants, and if you add the optional feeties, socks and shoes are banished too! Designed to be completely seamless for your baby's ultimate comfort, these longies are knit in the round with worsted weigh wool, to keep baby warm (and keep the knitting to a reasonable time frame!)

The pattern includes six sizes, from preemie to toddler to cover your baby from birth to potty learning. With every detail carefully thought out, we explain in full detail and vivid color photos how to execute each technique to knit the perfect fitting pants.  A size chart, including rise, inseam, waist and suggested weight range is included so there's no guesswork on sizing. Even if you are a relative beginner, this pattern is so thoroughly explained (down to the abbreviations key and pictures in the appendix) that you can easily learn a whole host of new techniques from doing this pattern. As always, tech support is included with the pattern, so if you have any questions you can always contact us.

Included with the pattern is optional color work charts if you choose to do color work at the ankles, as well as details on how to do bootie feet if you prefer them to the ribbed ankle cuffs."