I highly recommend reading this article if you are interested in having your child's portraits or your family portraits taken. It's a good read and highly informative.
It is helpful in understanding why photographers charge what they do, the time involved on the photographer's end that you don't see, and why investing in custom portraiture is one of the best options for truly capturing your family.
You will notice that many photographers will not have a link for 'pricing' but rather they have a link for 'investment.' I truly believe that it's just that. An investment.