Bangladesh’s once-praised family planning system is buckling under severe contraceptive shortages, raising fears of a rise in unplanned pregnancies in one of the world’s most densely populated countries.For decades, the South Asian nation was hailed as a success for slashing birth rates through an expansive state-backed family planning programme that sent field workers door to door with pills, condoms and advice on birth spacing.But that system is now faltering, with government clinics across...