"Deadlock" has that rare distinction of being a fairly generic episode that slips in a fairly huge impact on the series.
It's another of those crisis episodes with spacial paradoxes that leave everyone scrambling to survive. There're plenty of episodes like that. You can watch it to enjoy how it does that. And while you do that, you can see Naomi Wildman born. And then die. And then come back because there's another one on the other ship. Harry Kim does, too, and is replaced by his doppelganger.
Hey, it happened to Miles O'Brien, too.
Otherwise, move along.
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Memory Alpha summary.