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PKU is inherited. Both parents have to carry the PKU gene in order for a child to be born with PKU. You can carry the PKU gene but not have PKU yourself. If you and your partner both carry the gene, your children have a chance of having PKU.2
It's not your fault
You are not to blame for your child's PKU. There is nothing that either parent did prior to or during the pregnancy to cause PKU. You wouldn't blame a friend whose child had PKU. Be as kind to yourself as you would to a friend. If you find yourself depressed, anxious or angry, consider seeing a therapist who can help you work through these issues and feel better again.
