In the US, sheets for infants are generally required to be flame retardant. The sheets in question probably aren't, so they're covering themselves legally by saying they're not for use by those under age 3.
They used their bed sheets
Bedlinen is the cloth used to make up a bed, such as sheets and pillowcases, once made of linen but now of materials such as cotton or polyester.
nice bed sheets cotton double bed sheets
Both are correct but refer to different things. "In Bed" refers to a when a person/object is under the sheets of a bed, but above a mattress (and possibly other sheets). "On Bed" refers to when a person/object is on top the bed.
When placing bed sheets on the bed, the fitted sheet goes first and the flat sheet goes on top of it. You can use a mattress pad under both sheets.
It means to have sex. Like you have sex under the bed covers.
it can be used for mainly anything: shirts skirts bed sheets it is very popular as polyester is a non-crease fabric, whilst cotton is soft, comfortable and breathable.
double bed sheets
No... But you can buy normal penguin bed sheets.
The Vermont County store offers sheets for sofas and also offers bed sheets for sale whilst eBay also stock sheets for sofas and also bed sheets at very cheap prices.
Look on the Twister bed sheets website or Facebook page.
Polysester can be used in safety belts, some boottles, bed sheets, bedspreads and curtains. A longer list and in dept information kan be found at http://en.wikipedia.org/wiki/Polyester