This article gives some hints. I put on a new sweater I just knit, and it pilled the first day. The only thing worse is all the moth holes I get in new sweaters.
I just knit 4 kids sweaters for my 4 grandchildren for Christmas. Because I send them away, I do not have a chance to see how they wear. My one grandson took a particular liking to his sweater and wore it every day for a week. My daughter said that while it wore well, it had a lot of pilling. Is there a better brand of acrylic that does not pill or is using a blend the answer to my problem? Thank you.