However, they will not get as much protection as a baby who is wholly breast fed.
In the study, 62% of children were breastfed, and 30% were breast fed exclusively for two months.
For instance, breast-fed babies get a shot of maternal antibodies along with mother's milk.
"This two-fold increased risk went away when we looked only at women who breast-fed, " Ursin says.
The American Academy of Pediatrics says breast-fed infants should get 400 IUs of supplemental D daily.
Researchers looked at the nutritional value of including two different varieties of egg yolks as weaning foods for a group of breast-fed and formula-fed infants.
The other half were exclusively breast-fed unless the doctor ordered formula.
All the infants were African-American and breast-fed without supplemental vitamin D.
Both breast-fed and formula-fed babies who had been given n-3 fatty acid enriched egg yolks had 30-40% greater red cell membrane DHA levels than those fed normal egg yolks.
In a study published in the Canadian Medical Association Journal, researchers led by Anita Kozyrskyj found that babies born by C-section harbored a different set of microbes in their digestive tracts than those born vaginally, and that infants who were breast-fed had a different recipe of bacteria in their guts than those who were given formula.
Breast feeding also resulted in a change in microbes, with formula-fed babies showing more Peptostreptococcaceae bacteria and Clostridium difficile.
In Kelly's case, once the baby was admitted to the hospital, she began to use formula, fed through a syringe -- she was told to avoid bottles because the baby would reject the breast.
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