Should I put dendrobium seedlings on winter rest?

[LilianaLM]

Hi everyone!

This is my first winter with orchids ! I have a few dendrobium seedlings, and I have a question about winter rest. 2 of them are having new growths (my logic tells me to continue watering and fertilizing) ; one dendrobium jenkinsii seedling that I am not sure if I should put on winter rest ( attached picture, and I think has new growths) and another dendrobium (i think? ) no ID but it would be great if anyone knows what type of dendrobium it is ( picture attached) and not sure if I should put that one on rest, I have had it since August 2017 and it looks exactly as the day I got it, no growth, no new leaves or anything, only 2 new roots that I see in the pot, seem like no longer growing. Any advice is highly appreciated!