My dd is 3.5 weeks old...I was just curious if anyone knew how long it takes to see signs of a food allergy. I ask because my ds is allergic to milk, eggs and peanuts. I didn't start to notice his bad eczema until he was 3-4 months old. However, I have noticed that my dd has had a spot here so there sometimes after she nurses. She doesn't have eczema like my ds did but she's only a few weeks old...could she be showing signs of allergies already?