Prolonged formula feeding, delay in solid foods associated with increased risk for pediatric ALL

Results of one study indicate that the risk for developing pediatric acute lymphoblastic leukemia increased the longer a baby was fed formula and the longer solid foods were delayed.

"For every month that a child was fed formula, taking into account other feeding practices, we found that the risk for this type of cancer was higher," said Jeremy Schraw, a graduate student at The University of Texas at Austin, who presented the findings of an at the 11th Annual AACR International Conference on Frontiers in , held here Oct. 16-19, 2012. "If a baby is fed only formula, he or she will not be getting any immune factors from the mother, which could be leading to this greater risk."

Schraw and colleagues surveyed 284 controls and 142 children from the Texas Children's and the National Children's Study in Houston, San Antonio and Austin, Texas, who had been diagnosed with (ALL).

Compared with controls, children diagnosed with ALL started solid foods significantly later, more of their mothers smoked during pregnancy and they had a longer duration of formula feeding.

Researchers found that the risk for developing ALL increased by 16 percent for every month of formula feeding. In addition, for each month the introduction of solid foods was delayed, the risk increased by 14 percent.

"One explanation for this co-risk may be that it's the same effect being picked up twice," said Schraw. "Children being given solid foods later may be receiving formula longer."

Future research should address the factors influencing prolonged formula feeding and delay in solid food introduction, according to the researchers.

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