What’s worse is that overweight babies are more likely to be obese in childhood, putting them at greater risk for developing type 2 diabetes. Indeed, contrary to the popular belief that children are primarily at risk for type 1 diabetes (previously referred to as juvenile diabetes), poor lifestyle choices including minimal exercise and poor nutrition has caused more and more to be diagnosed with type 2 diabetes.
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Let's break this down abit. What is their definition of an overweight baby - what weight, and are they talking about birth weight or later weights?

What charts are they using (breastfed only charts or other)? Have they accounted for how the baby is fed?

If it is poor lifestyle choices etc, then obese children could have nothing to do with a mother having 'gestational diabetes'.

actually it is so confsuing, it is hard to make anything concrete out