So we need to put baby's cereal like healthy times , happy baby, in the fridge upon opening ?

For freshness sake, seal it properly and place it in the refrigerator. If the stock finishes fast, I would also put into the refrigerator just to keep fresh.

I seal them in a air tight container to maintain its freshness as well. Best to put them in the refrigerator.

thanks

I put them into the fridge