Unwrapping gifts Christmas morning can become unpleasant if the toys children are getting aren't appropriate.

"Young children get frustrated with toys and games not suited to their physical or mental capabilities," said Erika Kravic, R.N., Children's Hospital Foundation Office of Child Advocacy of Kosair Children's Hospital.

"And some toys can have parts that are dangerous for a younger child," she added.

Kravic listed four criteria for toys and games:

Well-constructed, durable and safe for the child's age

Suited for the physical abilities of the child

Appealing and interesting to the child

Suited to the child's mental and social development

It isn't easy. Kravic said that even innocent-looking toys, such as marbles and balloons, can present dangers to children.

Often, toy buyers don't read labels that provide information on ages. There are several things to avoid when buying toys for a child:

No toys with small removable parts

No toys with sharp points or edges

No toys with strings, straps or cords longer than seven inches

No toy cap guns, because the roll of caps can be ignited by the slightest friction and cause serious burns.

Age appropriate toys are important, too, Kravic said:

Newborn to 1 -- Toys that appeal to a baby's sight, hearing and touch.

1- to 2-year-olds -- Must withstand a toddler's curious nature (stacking toys, sturdy dolls).

3- t0 5-year-olds -- Experimental toys or those imitating parents and older children.

5- to 9-year-olds -- Toys that promote skill development and creativity.

10- to 14-year-olds -- Scientific toys or those encouraging hobbies.