Although biologics cross the placenta, research shows they lead to few infections in babies after they’re born. The prospect of pregnancy can be daunting for women with inflammatory arthritis. Not only can disease flares occur, but a host of medications — including the commonly prescribed methotrexate — are off-limits because of concerns about birth defects and complications. There’s also a worrisome information gap on the effects of many medications during pregnancy, since pregnant women are usually excluded from clinical trials. One type of medication, tumor necrosis factor inhibitors (TNF inhibitors), is increasingly used during pregnancy after animal studies did not show a risk to the developing fetus. But that left…