However, they chased down the target of 104 runs in 17.3 overs for the loss of five wickets to maintain their 100 per cent win record.
Slower balls with little turn caused trouble for the Bangladeshi batsmen, who had shown power hitting in the previous matches, and their biggest hitter Afia Protasha was dismissed for only seven runs in 10 balls.
Every other batsman reached two figures, but none could cross the 22-run mark as Bangladesh were reduced to 86-5 and 10 dot balls built up the pressure.