Children build self worth by getting messages from their parents that they are valuable. When a parent spends time on and with their kid and puts their needs first, this tells the kid that they are valuable. If a kid's needs are neglected this gives the message that they aren't valuable. This was the message that I got as a kid.

I think that to correct this a person needs to see that their parent's were wrong. Every child is valuable and deserves to be taken care of and get their needs met.