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Since if you don't believe in yourself you won't be able to let your instincts kick in, when they are needed. Intuition is a huge part of parenting, since in order to take care of your child you need to be somewhat proactive.
But a lot of times this self confidence of mothers gets toned down because of the mom's guilt. Mom guilt is a huge phenomena that almost every mother goes through.
A very interesting paradox between both of them is that one can't exist without the other. In fact if your self doubt increases so does the mom guilt. This is why it is so important to manage one's feelings before and during parenthood. Because without self confidence you won't be able to take care of your child the way you want to. In order to be a good parent to your child you need to believe in your own parenting style.