Grossed out!

I HATE INSECTS AND ABOVE ALL, COCKROACHES!!! My Mom found several baby cockroaches in the cupboard under the kitchen sink yesterday. She believes there is a nest there. How in the world did they get there?!? That is still a mystery to us since neither my Mom, me or my brother opens that cupboard or use the garbage dump in it. My Mom sprayed baygon in it and let them suffocate inside. Later on, one of the baby cockroaches tried to squeeze out of the cupboard, in vain. Because my Mom happened to be standing outside when it tried to escape. I suggest we seal that 'cockraoch nest cupboard' for good. I think there may be a hole where they enter. They are the most disgusting insect species I've seen before and it gives me the creeps just thinking about them now. Eewwwww! :S