For the last couple of weeks my ds has been puffy in the face, whingy and holding his head a lot as if he had a headache. He's 21 months. The puffiness made me think it was an allergy but his only allegy that we know of is to prawns and there isn't a prawn in the house.
I've watched what he's been eating like a hawk, checked labels, talked to the child minder and been at a complete loss until finally on Friday I caught him leaning over the edge of the raised fishpond in the garden and putting a piece of fishfood in his mouth. Having checked the contents, it contains shrimp meal, whatever that is.
Three days later he's back to his bright, cheerful, imp-faced self. So to anyone struggling with the same, suggest you check the pet food, like I should have done weeks ago.