A new study finds that first-born children have a higher risk of diabetes and high blood pressure.

The researchers analyzed data on healthy children, ages 4 to 11.

The first-born kids had 21 percent reduced insulin effectiveness, which is a known factor for diabetes. They also had higher blood pressure.

The researchers suggest the differences could be due to changes that take place in the mother’s uterus during a first pregnancy. These changes increase the flow of nutrients to subsequent fetuses.

They say more research is needed to find out how the study’s results relate to risks in adulthood.