Water your seedlings from the bottom. set the containers in the sink or pan of water so that the roots can draw up the water. When the surface of the soil feels moist remove the seedling containers from the water and let excess water drain away. If they aren' drawing up the water, the soil is too dry which happens with soiless mixes and seed starting mix. Lightly moisten the soil with warm water rather than cold water. The warm water is more easily absorbed by dry soil.