Jody, from Barnsley, said her son was diagnosed with coeliac disease when he was just one.
“He deteriorated really fast,” said the 43-year-old said.
“It started with constipation and then it just got worse to the point where we couldn’t actually leave the house.
“He was in pain and we just got back from A and E when he projectile vomited.”
She said after the diagnosis he was “like a different child”.
The ICB said it had surveyed the price of bread in several supermarkets and found at the highest end Lidl’s GF 480g white loaf was £2.99 compared to an 800g normal loaf for 49p.
Jody said her family would struggle as a result of the change, saying: “Prescriptions [have] saved us an absolute fortune, it makes a massive difference.
“Buying gluten-free bread in the supermarket is not cheap, we would have to cut corners elsewhere. The cost of living crisis is massive and taking prescriptions away from under 18s will be really detrimental.”