Sent in to bat first, the junior Tigers put up a challenging total of 295 for eight wickets in 50 overs.
In reply, the hosts chased down the target scoring the match winner 296 for 6 in 49.1 overs to seal the victory by four wickets.
Batting first, Bangladesh’s top-order batsmen did well. Both of the openers- Tanzid Hasan and Parvez Hossain Emon- hit fifties.
Tanzid scored 51 off 44 balls with nine fours and one six while Emon finished on 55 off 82 with five fours and one six as well.
Besides, Towhid Hridoy and captain Akbar Ali also struck the fifties. Towhid hit 73 off 77 with two fours and three sixes, while Akbar posted 66 off 44 with eight fours and two sixes.
Mahmudul Hasan Joy (13), Shahadat Hossain (12) and Avishek Das (13) were the other notable batsmen reaching double digit.
For New Zealand, David Hancock bagged three wickets while the captain Jesse Tashkoff took two wickets.
In reply, New Zealand lost their first wicket just in nine runs. But in the second wicket stand, they added 122 runs, which laid the foundation for a tremendous win for them.
Number three batsman of New Zealand Fergus Lellman hit 76 off 71 with 10 fours and two sixes while opener Ollie White posted 45 runs.
After taking two wickets with the ball, New Zealand captain Jesse Tashkoff hit 66 off 77 with three fours and ensured the win for his team. They ended on 296 for six in 49.1 overs.
For Bangladesh, Asadullah Galib bagged three wickets conceding 78 runs in nine overs. However, other bowlers were poor in the middle in this game which eventually handed Bangladesh a defeat.
The fifth and last game of the series will take place on October 13 at the same venue.