At what age can a child start sleeping with an adult sized pillow?

Actually, children do not need a pillow, however, they always want one (like mom, dad, sibling,etc). It is permissible to give a pillow to children between the age of 2 and 3. Rule of thumb: A child's shoulders must be wider than their head, start with a flattist, fairly firm pillow, pillows should be use in a normal bed not cot.