The yarn is Glaciar Del Cielo by Aslan Trends. The yarn is a very soft sport weight cotton. Cotton seems like the best fiber for babies doesn't it? Easy to care for and not itchy. The no-wool factor is nice for my fingers as well, since I seem to have developed a wool sensitivity.
It's a fairly easy pattern to make. The only parts that may be difficult for a beginner are the pockets and the neckline. I redid the buttonhole once because it didn't come out right the first time. If you haven't made a sweater before a baby sweater could be a nice way to start. See this project on Ravelry.