My 3 month old had developed a bald spot on the back of his head from his cotton crib sheet and I was really on the fence about what felt like splurging for silk crib sheets but I just felt like having his little hairs yanked at night must be so uncomfortable so I just went for it. It has only been two nights so it is too soon to see about his hair, although I am confident it will grow back.
An unexpected benefit of these sheets however, is that my baby has slept his longest stretches in the last two nights since putting the sheets on his mattress. He went from waking up every 2-4 hours (with an occasional 6 hour stretch) to sleeping a full 8. 5 hours two nights in a row. This is incredible. I know it has everything to do with how much more comfortable he is sleeping on this sheet.
I washed the sheet before putting it on his mattress and it washed and air dried beautifully. He has an ikea sniglar crib and a newton mattress and the sheet works perfectly with both- fits the newton mattress well and does not snag on the natural wood of the crib.
I will be buying a spare!