Aaron, how tall are your seedlings? If they are very skinny and tall, they may not be getting enough light. Do your pots have adequate drainage? If the soil is too moist,due to lack of drainage and/or overwatering, the seedlings can get "damping off" and die.
If the soil gets too dry between waterings, you may need to keep them out of direct sunlight until they are a bit larger. How hot is the morning sun in your area? Telling us where you are located will help us help you.
Also are your pots in an area where a cat could get to them. They may be too small to handle having a cat roll around on them. Hope this helps.

Here is a link that might be useful: Damping off