You can begin with trying out mild spices like; cinnamon, ginger, turmeric, asafoetida, turmeric. And later graduate to cumin, garlic, coriander, clove, chilly etc. While they are small, say, one-year-old, one has to start introducing them to mild spices. Once, they develop a taste of them eating them regularly, introduce them to other spices as well. Make their favourite dish and introduce the spices slowly and steadily. It is such a gradual process that you wouldn't even come to know how they developed the taste of spices. http://www.fieldsofflavor.com/taste-bud-development-in-infants/
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