No Grains for Babies Before 6 Months
Here is a reason to observe the no grains for babies until 6 months recommendation. Essentially, introducing gluten into a baby's system before the gut barrier is developed seems to increase the likelihood of a life long allergic reaction to grains.
"Babies had a lower chance of developing the digestive disorder coeliac disease if they were not fed grains until aged four to six months, they found. This condition is caused by proteins in grains, which damage the gut and make it difficult to digest foods."
"Children not exposed until they were older than seven months were also more likely to develop coeliac disease than infants exposed when they were aged between four and six months. "