Women with PKU need extra support to have healthy pregnancies.

High phenylalanine levels during pregnancy can restrict the normal development of the unborn baby. This can cause permanent harm, such as brain damage (leading to learning difficulties), microcephaly (a small head), heart defects and a low birth weight. This damage is known as maternal PKU syndrome.

Women with PKU need to be reassured that they can have healthy pregnancies with the right planning and support.

The "Bumper Pack" document has more information about managing PKU in your pregnancy.


As part of our research and advocacy work, NSPKU has called for improvements in the care available for women with PKU to support their pregnancy and maternal experiences.  You can read more about our research here.

Please Note
The dietary treatment for PKU varies for each person so all information produced by the NSPKU is for guidance only.  NSPKU publications should only be used in consultation with your own dietitian and/or doctor. Please see here for copyright details.