LUCILA SIGAL  IN the Argentine capital Buenos Aires, a city famed for its passionate tango dancing and romance, the pandemic is putting a dampener on couples making babies, with birthrates down by a quarter since COVID-19 struck early last year. Claudia Becerra and her boyfriend Agustín Cacciola have long dreamt of having a child, but strict quarantines and economic malaise from the impact of the virus have made them put off their plans. "Uncertainty is the most difficult thing we face," Cacciola, a 32-year-old lawyer, told Reuters alongside Becerra, an accountant, at their home in the Belgrano neighbourhood. He lost…