If it is plain chwee kueh without the radish it should be fine because it is plain rice cakes. It is not very ok if the whole packet already has the radish on the kueh and then you use that to feed your baby becaues the radish itself is very very oily.
As for Yam cake, I personally dont't like it... So I hardly eat it to tell if it has any seasoning in it.
Some of friends do intro from time to time "table food" to help their babies get used to eating with them when they turn 1 or 1.5 years old. But they make sure the food is plain enough.