Once your seeds have sprouted, there are things you need to do to encourage them to grow strong and healthy. Seedlings grow best when they have plenty of light. Most of the time the light coming through the window isn’t going to be enough for your seedlings. Seedlings need a consistent source of light. An easy way to do this is to install grow lights over your seeds. You can use full spectrum T-12 bulbs (these fit a standard shop light fixture) or T-5 fluorescent bulbs. Next to light, watering is most important. Check your seedlings every day and keep the soil moist, not soggy. Don't use water that is too cold (or too hot). Fill up your watering can and let it set out overnight. That way the water will be at room temperature when you water your seedlings. Or simply install a small fan and run it 5-10 minutes twice a day. Doing these things will help your plants get ready to move out into the garden.