4 1/2 year old daughter w/ little hair

My daughter is 4 1/2 and still has not had a real haircut.  I have trimmed the longer layers just to try to make it look even.  Her hair is just to her neck.  It is growing very very slowly.  All of the children that I have seen my daughter's age have hair about 10 times longer than hers.  It has maybe grown an inch since a year ago.  I am very concerned about her hair growth.  I have had her to the pediatrician and a dermatologist who both say that she is fine.  It is hard not to worry about her.  I am just wondering if anyone else out there has had this problem with their children??  She is healthy in every other way and is a beautiful girl!  I just feel bad that she can't wear her hair the way she wants to.  She wants a pony tail so bad!  All of her friends have beautiful long hair that they can wear up.  Please respond if you have had the same problem!

           Thank you,   Aliwalsh (concerned mom) 

Its simple GENETICS! nothing is wrong she just needs more time and maybe shes just going to have thin hair look at your hair your husbands hair usually a baby has a combination of that. Just give her more time and maybe she just wont have much hair it can happen and some people have slow growth also she may have not hit a growth spurt. Also put little clips in the front of her hair and tell her that is her pony tail for now and tell her its beautiful she should not be compared to long haired children her hair is just as beautiful:)