Lisa Gregory is annoyed that she will have to fork out at least £2,000 to pay for treatment to help her six-month-old son, Lewis, who has flat-head syndrome.
The condition, which is known as plagiocephaly, or brachycephaly, involves the back of the head being flattened on one side, causing the forehead to bulge and the ear to be misaligned.
The 26-year-old mum-of-two believes her son's condition can be corrected using a special helmet - a treatment she cannot afford.
But Lisa told The Gazette she can't understand why it is not funded by the NHS.
She said: "Flat-head syndrome can affect brain development and if it is not corrected early, nothing can be done about it when they get older because the bones become too hard.
"I know there is a treatment, which would involve Lewis wearing a helmet for 23-hours-a-day, which I've heard could fix the condition.
An NHS spokesman confirmed that treatment using headbands or helmets is not funded by NHS Fife.
He added: "Although there has been considerable interest in the use of headbands or helmets to alter the relative growth of the skull, it is believed by Fife paediatricians that there is not enough clinical evidence to back up this theory.
This is in line with the rest of Scotland."