According to the Food Allergy and Anaphylaxis Network, milk is one of the most common allergens for children under age three. Most infants who are allergic to milk exhibit symptoms early, during their first year, and many outgrow it.

Most toddlers engage in physical play and exercise on a daily basis, as they learn how to interact with their environment and peers and develop skills such as jumping and climbing. However, sometimes exercise can lead to troubling symptoms such as coughing.

You always try keeping your toddler healthy, but illnesses are bound to happen — particularly if your toddler is in daycare. Chronic bronchitis or sinusitis are the likely culprits, so always consult your toddler's pediatrician if your toddler has a cough and runny nose that last more than a week or two.

A rash on your infant’s foot often is caused by hand, foot and mouth disease. HFMD is common viral illness that is spread easily in day care centers by both caregivers and other children. Your doctor performs a simple exam of your infant’s feet and hands, as well as throat, to make a proper diagnosis.

Iron is a nutrient found in your body that comes entirely from your diet. It is found in fortified cereal, meat, beans and leafy green vegetables. Iron is necessary to make red blood cells and carry oxygen. Most of the iron in the body is found in red blood cells.

A rash that appears anywhere on the body of a tiny infant can be distressing. However, a rash that appears behind the ears of a baby often can be identified as a particular, treatable condition.