Many parents of infants eagerly await the milestone of introducing solid foods for the first time. When this milestone is reached (four to six months of age), pediatricians have long advised parents to introduce foods slowly and one at a time. This way it is easier to identify the culprit if an infant has an allergic response that can show up as anything from a mild rash to vomiting, cramps, diarrhea, eczema, hives and, in severe cases, anaphylaxis (throat swelling and difficulty breathing).
For infants, the most common allergy-causing foods are milk, eggs, peanuts, soy and wheat. Tree nuts, shellfish and fish are common causes in older kids and adults. An allergic reaction occurs when a protein or other component of a food causes the same reaction every time the child is exposed to that particular food. It is relatively uncommon, occurring in 2 to 8 percent of infants and children under the age of three years.
While pediatricians still urge parents to introduce one new solid food about every three to seven days, most pediatricians have abandoned the old recommendation to avoid highly allergic foods until at least one year of age. Foods like fish and eggs, and foods containing peanuts may be introduced at four to six months when other first foods are introduced. In fact, introducing these foods prior to a child’s first birthday may lead to decreased risk of food allergy later. (The one exception is milk, which should be delayed until at least one year of age due to an infant’s inability to absorb and digest milk. Milk also lacks the necessary vitamins and minerals found in breast milk and formula.)
In addition to better understanding when and how to introduce foods, a growing body of research suggests other steps parents could take to reduce allergy risk. Here is a summary of our latest understanding:
- Maternal dietary restrictions during pregnancy and lactation probably do not decrease risk of food allergies, with the possible exception of eczema, which may be lessened by avoiding highly allergic foods such as those mentioned above.
- Exclusive breastfeeding for at least three months decreases the risk of wheezing in early childhood. Breastfeeding for at least four months decreases risk of cow milk allergy and eczema in the first two years of life.
- Soy-based infant formula does not prevent or treat allergy resulting from cow-milk-based formula.
- Antibiotic exposure in the first year of life may be associated with increased risk of food allergies, especially infants that are exposed to multiple rounds of antibiotics.
- Vitamin D deficiency in infancy may increase risk of food allergy for some children. (The American Academy of Pediatrics recommends that all children take a vitamin D supplement to prevent vitamin D deficiency.)
If you have concerns that your child may be demonstrating signs of a food allergy, you should discuss your concerns with your child’s pediatrician.
*Post adapted from “Eat Your Vegetables” and Other Mistakes Parents Make: Redefining How to Raise Healthy Eaters (Healthy Learning, 2012).
Natalie Digate MuthContributor
Natalie Digate Muth, MD, MPH, RD, FAAP is the Senior Advisor for Healthcare Solutions for the American Council on Exercise, a board-certified pediatrician and Fellow of the American Academy of Pediatrics, a Diplomat of the American Board of Obesity Medicine, registered dietitian and board-certified specialist in sports dietetics, and ACE Certified Health Coach. She is the author of "Eat Your Vegetables and Other Mistakes Parents Make: Redefining How to Raise Healthy Eaters" and the textbook "Sports Nutrition for Health Professionals." She has been ACE certified since 1998.
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