I propose killing all mosquitoes, mainly by
Kill (swat) the mosquito, by slamming a wall to the opposite wall, while the mosquito is in the trap.
first, shut the trap door (probably necessary for swatting, unless swatting too fast).
next, swat the mosquito
The middle wall, while next to a wall, will slam to the opposite wall with opposite polarity of magnetism. For turn-taking, alternate the polarity of generated magnetism.
The mid-wall probably needs a path for vertical stability (like streetcar, or train). One, two, or three of the walls (not that with the closing door, but parallels), will have the path for the mid-wall to hook into. There, the mid-wall is sliding to slam the opposite wall.
Warning: If babies might stick their fingers into that machine, their fingers might be hurt. Keep that machine out of their path (that is wise for keeping the baby (& yourself) out of the path of the coming mosquitoes, too). For safety, the machine might have some net at the front. That front has to be longer than a baby's finger, then comes that machine's door, and beyond that is the working thing (after the door is first closed). (The net's width needs to be big for mosquitoes, but small for a baby's hand to pass).
To slam (swat), is probably the most straigtforward DIY (do-it-yourself) option, for killing a trap-borne mosquito. But if you might have relatively fancy technologies such as a high-power laser, or a vacuuming unit, you might think working with those, too.
To hit the opposite wall, you need to know the present wall. But that is no problem.
If unsure, slam successively. If the first was to where that already was, nothing will happen at that first turn. Idempotent. But next, will slam to the opposite wall.
Normally, that is wise to know the state of the mid-wall, not to waste that extra energy for (generating magnetism for) double slamming. But that is handy for or discovering the state, when switching the machine on (with new battery, or harvesting the Sun in some new morning). But, resetting to a specific wall as the starting wall, is trivial, too.