I was eating crab on Saturday night and prawn on Friday night. My daughter who is 2 years and 6 months old started to get a rash on Saturday morning and it got worse on Sunday morning. We took her to private doctor in Hua Hin Thailand where we currently are staying and they have said it is a allergy to seafood from breast feeding. It is only a itchy rash. No temperature, no vomiting, no pain apart from itchy. No other symptoms. How long after eating seafood until its passed through? My daughter keeps asking for milk and I am worried it will make her worse. We are on anti biotics, cream for itching and a third cream I am unsure of.