It depends how severe your baby's symptoms are. If I had that my baby would be in hospital. If you are wanting to confirm any symptoms though it should be through a controlled challenge, rather than randomly eating a biscuit.
Definitely depends on your baby. I had a few spoonfuls of custard and the next day my LO had a head to toe rash
Thanks for your replies! To give you an update: I ate it and nothing happened. Skin and poop have not changed! And this biscuit contains so many allergens! 😊
Eat it