My minimally-educated guess would have to lean toward the fact that it was three weeks of Atkins with *no vitamins.* Atkins induction (though not other low carb programs, necessarily) will *cause* a vitamin deficiency if you don't suppliment.

Think of Pantene and their claim to fame being B vitamins directly in the shampoo...

I don't mean that as a criticism - if you can juggle being a wife, a new mom *and* doing Atkins, I worship you. It's just beyond resonable expectation, that's all. One challenge at a time: no one is "superwoman."