1Round 1
First round we're focusing on two things: 30 damage per second lava is a lot in the early rounds, this, paired with ability damage will allow you to control space and deal a lot of damage.
[Field Rations] is recommended for Control or Clash to improve your survivability while holding point, but if Push, then go for [First Aid Kit] instead.
Items that increase or modify your health stats are great since they also apply to Baby Dva.
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2Round 2
Unless you pop off, it is rare to get enough money for purples without leaving you too vulnerable.
We're not allowed to have fun yet, so focusing on armor and damage reduction is the play.
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3Round 3
This is where (some of) the fun starts. You will swap your micro missiles for heavy missiles, they're a lot quicker, so it allows you to get in and out fast while still pouring lava everywhere.
[Nano Cola Nitrous] is going to turn you into an unkillable monster.
Paired with the survivability items from round 2, you'll find Baby Dva an absolute pain to kill for the enemy team, allowing you to hold point regardless if you have supports with you or not.
Get demech'd Nano Baby Dva farms mech Get demech'd.
You get the idea.
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4Round 4
We're going all in on our infinite Baby Mech Baby Mech loop and now we're going to add [Busan Blaster] to your inventory.
This thing is insane, it penetrates shields and deals a lot of AoE damage, paired with [Nano Cola Nitrous] you'll be dealing MASSIVE amounts of damage.
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5Round 5
[Counter Measures] late game is a game changer, we previously swapped micro missiles for HEAVY missiles, and with this power, you'll have a missile launcher system the likes the world has never seen before. Specially if there are trigger happy enemies.
You want to double down on this strategy with Champion's Kit to increase the damage your heavy missiles do.
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6Round 6
At this point, your build and potential is nearly complete. You will have a lot of freedom to acquire a purple item depending on the situation.
[The Closer], [Macro Missile], [Eye of the Spider], [El-sa'ka Supressor] are all great weapon items to get if you feel you're having trouble finishing up kills.
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7Round 7
You got a taste of heavy missiles spam in the previous two rounds, you're shredding everyone and if they get lucky to demech you, they still have to face Nano Baby Dva over and over again.
Ultrawide Matrix allows you to shoot out even more missiles while adding tons of survivability.
You'll find diminishing returns for your early game blue items, and you should be looking to replace them with [Nebula Conduit] and [Ogundimu Reduction Field] if you find yourself with extra cash to spend. You can't go wrong with this selection.