How Do I Start Vegetable Seeds Indoors?

Is there a chance you're falling victim to "damping off"? It's where otherwise healthy seedlings suddenly become weak and die. It's caused by a fungus that attacks the plants. I've had this happen myself.

Over-damp soil and lack of airflow can lead to the problem. Try not to water the foliage when watering, and keep covers ventilated if you're using them. Making sure your seedlings are properly thinned out can help too. There are home-made sprays that use chamomile tea or hydrogen peroxide to help prevent the fungus, if you wanted to search for them. I've read a sprinking of cinnamon powder on the soil can work too. Good luck with your gardening!